Answer: A waterfall is a point in a river or stream where water flows over a vertical drop or a series of steep drops.
Explanation:
which of the following is a necessary component in the formation of sedimentary rocks? group of answer choices melting of a precursor rock weathering of a precursor rock high viscosity differential stress
The necessary component in the formation of sedimentary rocks is weathering of a precursor rock. Therefore the correct option is option B.
Sedimentary rocks are one of the three main rock categories that make up the Earth's crust. Sedimentary rocks are rocks that are made up of sediment, which is made up of tiny particles of sand, shells, and other materials that settle on the bottom of bodies of water.
The breakdown of rock by physical, chemical, or biological processes is known as weathering. Rocks and soils are damaged by weathering, which makes them smoother, smaller, and easier to transport.
Sedimentary rocks can be created by the weathering of a precursor rock. The resulting sediment is transported to a new location and then cemented and compacted into rock.
Thus, the necessary component in the formation of sedimentary rocks is weathering of a precursor rock. So, the correct option is B. Weathering of a precursor rock.
For such more question on sedimentary:
https://brainly.com/question/31060487
#SPJ11
The following question may be like this:
which of the following is a necessary component in the formation of sedimentary rocks? group of answer choices
melting of a precursor rock weathering of a precursor rock high viscosity differential stressa cold air drainage wind is called a a cold air drainage wind is called a santa ana wind. bora. foehn. katabatic wind. sea breeze.
Answer: Katabatic wind
Explanation:
Katabatic drift/wind, also known as 'cold air drainage' is a drainage wind that carries high-density air from a higher elevation down a slope under the force of gravity. This occurs in much the same way as water would flow off the land.
where is Paris, France located? my 6-month-old-nephew wants to know.
Answer:
western europe
western edge of Europe boarded by the bay of biscay
during a transgression of the sea, does the location at which beach sand accumulates move inland, move seaward, or remain stationary?
During a transgression of the sea, the location at which beach sand accumulates will generally move inland. This is because the sea level is rising and the area where the beach sand is deposited will expand further inland. This process is referred to as coastal retreat.
In addition to coastal retreat, other effects of a transgression of the sea can include changes in sediment deposition patterns and altered water temperatures. These changes can have a negative impact on coastal hazards. The extent of the effect will depend on the rate of sea level rise, the availability of sediment, and other factors.
In summary, during a transgression of the sea, the location at which beach sand accumulates will generally move inland.
Know more about sea level here:
https://brainly.com/question/2113249
#SPJ11
geologists measure the orientation of tilted rock layers. dip is the angle of inclination from the horizontal of a tilted rock layer. the compass bearing of a rock layer where it pierces the horizontal plane is called
The compass bearing of a tilted rock layer is known as the strike. It is the horizontal angle between the inclined rock layer and a horizontal plane. Geologists measure the strike and dip of rock layers in order to determine the orientation of the rock layer.
Strike is the compass bearing of a tilted rock layer where it pierces the horizontal plane. It is measured in degrees, ranging from 0° to 360°. It is determined by drawing a line along the length of the rock layer and taking a measurement from north.
Dip is the angle of inclination from the horizontal of a tilted rock layer. It is measured in degrees from 0° to 90°, with 0° being horizontal and 90° being vertical. It is determined by drawing a line perpendicular to the strike and measuring the angle from the horizontal plane.
The combined strike and dip measurements are used to determine the orientation of a tilted rock layer. This information is useful for geologists when studying geological features, such as faults and folds, in a particular area.
Know more about compass here:
https://brainly.com/question/28136911
#SPJ11
. how can the characteristics of the tropical and temperate climate zones be seen in the temperature map?
The tropical and temperate climate zones can be seen on a temperature map due to their distinct temperature characteristics. The tropical climate zone typically has a warm and humid climate, while the temperate climate zone is characterized by more moderate temperatures.
On the temperature map, the tropical climate zone will usually be displayed in red and orange colors to indicate its high temperatures, while the temperate climate zone will be displayed in cooler colors such as blue and green.
In addition, the temperature map will typically show the highest temperatures at the equator and the lowest temperatures near the poles. This is because of the Earth's tilt, which causes more direct sunlight to hit the equator and less direct sunlight to hit the poles.
The temperature map will also show the change in temperature over the course of the year due to seasonal variations.
In conclusion, the tropical and temperate climate zones can be seen on a temperature map due to their distinct temperature characteristics. The tropical climate zone will typically be displayed in red and orange colors to indicate its high temperatures, while the temperate climate zone will be displayed in cooler colors such as blue and green.
Additionally, the temperature map will show the highest temperatures at the equator and the lowest temperatures near the poles, as well as the change in temperature over the course of the year due to seasonal variations.
To learn more about tropical and temperate climate here:
https://brainly.com/question/10856870#
#SPJ11
The remarks section of the Aviation Routine Weather Report (METAR) contains the following coded information. What does it mean?
RMK FZDZB42 WSHFT 30 FROPA
Answer: Frezeing drizzle with cloud bases of flight level 42 (4200ft) and a wind shift with a frontal passage 30 minutes after the hour.
Explanation:
what is an aquifer, igneous and metamorphic rocks are not good aquifers as they contain little natural porosity or permeability.
An aquifer is an underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted. Igneous and metamorphic rocks generally contain little natural porosity or permeability and therefore cannot be used as aquifers. Igneous rocks, for instance, form when molten magma cools and solidifies.
The cooling process does not leave much space for porosity and permeability. The recrystallization of the rock grains during metamorphism also does not leave much space for porosity and permeability.
Aquifers can be found in sedimentary rocks like sandstone, limestone and shale because the grains of these rocks are arranged in a way that allows for more porosity and permeability.
Know more about Igneous rocks here:
https://brainly.com/question/23555197
#SPJ11
During the winter, the amount of snowfall increases on a glacier, which causes accumulation and the glacier to thicken, and because there is not much melting this creates a net gain of ice called a __________ ice budget.
During the winter, the amount of snowfall increases on a glacier, which causes accumulation and the glacier to thicken, and because there is not much melting this creates a net gain of ice called a positive ice budget.
A glacier is a huge mass of ice that moves gradually over the land. Most glaciers are found in polar and sub-polar areas. Glacier ice is unique in that it moves. They are formed when the snow accumulates over the years and converts into ice. When snow accumulates in winter more than melts in summer, the ice sheet gains mass, resulting in a net gain of ice called a positive ice budget. Conversely, when the ice melts in summer more than snow accumulates in winter, the ice sheet loses mass, resulting in a net loss of ice called a negative ice budget.
During winter, the amount of snowfall on a glacier increases, causing accumulation and glacier thickness. In contrast, during the summer, the glacier starts melting, causing ablation and glacier thinning. A glacier's total annual gain or loss in mass due to these processes is referred to as the glacier's mass balance or ice budget.
Learn more about glacier at https://brainly.com/question/6666513
#SPJ11
explain the links between the tohoku earthquake and other natural hazards. how do the effects of the earthquake and linked natural hazards compare?'
The Tohoku earthquake and other natural hazards are interlinked. The links between the Tohoku earthquake and other natural hazards are mentioned below:
Tsunami: Tsunamis are a type of natural disaster that can be triggered by an earthquake. As a result, the earthquake off the coast of Tohoku caused a tsunami that devastated many coastal areas.Landslides: Earthquakes may cause landslides in certain areas.Fires: Earthquakes may cause fires as a result of gas lines breaking and electrical systems becoming damaged. This is also true in the case of the Tohoku earthquake.Volcanoes: Earthquakes may cause volcanoes to erupt, which can exacerbate the effects of an earthquake in nearby regions.In terms of their effects, the Tohoku earthquake and other natural hazards are linked in that they can all cause significant damage to infrastructure and people.
The damage caused by an earthquake, however, may be more severe and long-lasting than that caused by other natural disasters, especially if it is followed by aftershocks.
To know more about Tohoku earthquake refer here:
https://brainly.com/question/30699242#
#SPJ11
which is not true of earth's atmosphere? it protects us from deadly uv radiation, yet lets light through.
The Earth's atmosphere does not protect us from all types of ultraviolet (UV) radiation. While the atmosphere does protect us from some of the most harmful forms of UV radiation, some forms are able to pass through the atmosphere. The ozone layer, which lies in the stratosphere, helps to protect us from most UV radiation.
However, even with the ozone layer present, some UV radiation still passes through and reaches the surface of the Earth. This UV radiation can cause skin damage, cataracts, and other health issues.
These molecules absorb and scatter light in different directions, which can reduce the amount of light that is able to reach the surface.
Know more about Earth's atmosphere here:
https://brainly.com/question/13154099
#SPJ11
the lowest surface air pressures ever recorded are associated with question 64 options: frontal systems (cold and warm fronts). hurricanes (typhoons). cold and dry climates. sea level.
The lowest surface air pressures ever recorded are associated with frontal systems (cold and warm fronts).
Frontal systems refer to the boundary between two air masses with different temperatures, densities, or moisture content.
As a result, these areas frequently experience thunderstorms and even tornadoes. Cold fronts, warm fronts, stationary fronts, and occluded fronts are the four types of frontal systems that meteorologists study.
Cold Fronts: A cold front is a sharp transition zone separating a warm air mass from a cooler air mass. The air behind the front is usually colder and drier than the air ahead of it, and it is often cloudy and rainy or snowy.
Warm Fronts: A warm front is a narrow transition zone separating a cold air mass from a warm air mass. Warm air replaces the cold air behind the front, and it's often cloudy or rainy.
Occluded Fronts: An occluded front is a boundary between two fronts, one cold and one warm. The air behind the occluded front is generally cooler than the air in front of it.
Stationary Fronts: A stationary front occurs when a warm front or cold front halts its progress. When two air masses meet but neither has enough power to displace the other, they create a stationary front.
For such more question on air pressures:
https://brainly.com/question/28327320
#SPJ11
cyclogenesis is common: group of answer choices on the lee side of mountains none of the above on the peak of mountains on the windward side of mountains
Cyclogenesis, or the formation of cyclones, is common on the windward side of mountains.
This is because when moist air is forced to rise over a mountain range, it cools and condenses, leading to the formation of clouds and precipitation. The release of latent heat during the condensation process causes the air to become warmer and less dense, which can lead to the formation of a low-pressure system. As the low-pressure system intensifies, it can lead to the development of a cyclone or storm. In contrast, the lee side of a mountain range is typically characterized by drier and more stable air, which is less conducive to the formation of cyclones.
To know more about Cyclogenesis click here:
brainly.com/question/29742736
#SPJ4
what weather would occur if this were to happen?
When an air mass cP from Canada interacts with an air mass mT from the Gulf of Mexico, it creates a front known as a cold front that pushes the warm, moist air mass mT, creating unstable atmospheric conditions, which can lead to the formation of storms and tornadoes.
How does the cold front impact the weather?As the cold front advances, it causes a rapid drop in temperature and decrease in humidity, resulting in cooler, drier weather conditions behind the front. This is because the cP air mass is much cooler and drier than the mT air mass it is replacing.
Therefore, the temperature drop can be quite significant, often resulting in a sudden change from hot and humid conditions to cold and dry conditions.
Find out more about air mass on:
https://brainly.com/question/18201898
#SPJ1
the danube river is navigable and thus connects many of the countries of the european continent. true false
The given statement "the Danube river is navigable and thus connects many of the countries of the European continent " is True.
The Danube River is 2,860 km long and runs through 10 countries - Germany, Austria, Slovakia, Hungary, Croatia, Serbia, Romania, Bulgaria, Moldova, and Ukraine - making it the second-longest river in Europe, and one of the most important waterways in the continent.
The Danube River is navigable, meaning that large ships can sail its length and connect the cities, ports, and villages along its banks. By navigating the Danube, goods and people can travel between Europe's different countries with ease. The Danube River is also a major source of energy and food, and it supports important wildlife habitats and tourist sites.
To learn more about Danube river here:
https://brainly.com/question/1131091#
#SPJ11
easements vary greatly in the extent of that they impose on the encumbered land. a. duration b. legal standing c. disruption d. facility
Answer:
The correct answer is c. disruption.
Explanation:
The sentence is discussing how easements, which are legal rights to use someone else's property for a specific purpose, can differ in the degree to which they restrict or limit the use of the property by the owner. The options provided are different aspects in which easements can vary.
A) Duration
This refers to how long the easement is valid for. It could be a temporary easement or a permanent one.
B) Legal standing
This refers to the legal status of the easement. Some easements may be recognized by law and enforceable, while others may not have legal standing.
C) Disruption
This refers to the degree of interference or disruption caused to the owner's use of the property by the easement. Some easements may have little to no impact on the owner's use, while others may significantly disrupt their activities.
D) Facility
This refers to the purpose or type of use allowed by the easement. For example, an easement may allow for the construction of a road or the installation of utilities. The extent of the allowed facility can vary depending on the terms of the easement.
explain how the downslope, cool wind and upslope, warm winds develop in the early hours of the morning
Answer:
explain how the downslope, cool wind and upslope, warm winds develop in the early hours of the morning
Explanation:
when rain comes
how thick are all the john day rock deposits taken together? how many species do they contain, in total?
The john day rock deposits taken together will be 15,000 feet thick, with 180 species in total.
The John Day rock deposits are composed of multiple layers of sedimentary rock that are estimated to be around 15,000 feet thick in total. These rock formations contain a diverse array of over 180 species of plants, 100 species of fish, and several mammals, reptiles, and amphibians.
This region is a paleontological wonder, with fossils of creatures such as sabre-toothed cats, ground sloths, and camels having been discovered here. The John Day fossil beds are an important scientific resource, providing invaluable insights into the evolution of life on Earth.
To learn more about rock here:
https://brainly.com/question/25846908#
#SPJ11
you're excavating and discover a large fragment of a well-preserved ancient woven basket made of organic material. what chronometric dating method would you use to discover its age?
The chronometric dating method used to discover the age of an ancient woven basket made of organic material discovered while excavating is "radiocarbon dating".
Chronometric dating or numerical dating is a method of dating that uses radioactive decay to calculate an absolute age. The time taken for the radioactive element to decay to half of its original amount is the half-life of that element.
What is Radiocarbon dating?
Radiocarbon dating is a method of dating that uses the decay of carbon-14 to calculate an absolute age. Radiocarbon dating is used to estimate the age of materials that were once alive but have since decayed, such as wood, shells, and bone.
Carbon-14 is a radioactive isotope of carbon that is produced naturally in the atmosphere. When a living organism dies, it stops taking in carbon-14. The carbon-14 that was already in the organism starts to decay, turning into nitrogen-14.
The rate at which carbon-14 decays is constant, so by measuring the amount of carbon-14 left in a sample, you can calculate how long ago the organism died.
To know more about radiocarbon dating, refer here:
https://brainly.com/question/12693872
#SPJ11
which factor has a definite pattern of variation with respect to latitude? responses density density ph ph temperature temperature salinity
The factor that has a definite pattern of variation with respect to latitude is Temperature
Latitude is the distance of a location on the earth's surface from the equator. The geographic coordinate that determines the distance between the Earth's center and a point on its surface is known as latitude. The equator is the earth's equator. The distance of a location from the equator is measured in degrees of latitude. This the Temperature's variation with respect to latitude.
Latitudinal variation in temperature is due to the way sunlight is absorbed and distributed across the earth's surface. The higher latitudes receive less energy from the sun than the lower latitudes, which receive more energy per unit area due to the angle of the sun's rays. However, the amount of energy received by a specific region is affected by other variables, including the time of day, the season, and the presence or absence of cloud cover or water.
As a result, latitudinal temperature variations are complicated and can be affected by a variety of variables.
To know more about Latitude, refer here:
https://brainly.com/question/28606059#
#SPJ11
On the map, take a close look at the boundary along southern California and Mexico’s Baja California Peninsula. The arrows on the map show the direction and speed of the plates along this boundary in millimeters per year. Based on the speed and direction of the arrows, identify the type of plate boundary at this location. Which landforms or events are likely to occur there as a result? (Hint: It may be helpful to model the motion of the plates using your hands or pieces of paper.)
The Pacific Plate and the North American Plate move past one another along the San Andreas Fault in this area, which is now renowned as a transform border.
The ocean floor separating Baja California from the rest of mainland Mexico is what kind of plate boundary?The Gulf of California in Mexico is cut by a divergent plate boundary. Mexico's mainland and Baja California are being separated by the divergence. As a continent experiences continental rifting, magma rises beneath it, causing the continent to thin, fracture, and ultimately split.
Which kind of plate border runs through Southern California and the Baja California Peninsula in Mexico?Western California, which is a piece of the Pacific Plate, slides past the rest of North America along the San Andreas Fault, a transform plate border.
To know more about Plate boundary visit:
https://brainly.com/question/16568161
#SPJ1
true or false: with good planning, pyroclastic flows can sometimes be directed away from inhabited areas.
With good planning, pyroclastic flows can sometimes be directed away from inhabited areas: false. Pyroclastic flows cannot be directed away from inhabited areas as they are a highly explosive and destructive phenomenon of volcanoes. Pyroclastic flows are highly dangerous and fast-moving, with high temperatures and velocities, making them one of the most significant threats to life and property in areas near volcanoes.
With good planning, however, we can reduce the risk of harm and loss of life in areas adjacent to volcanoes. Pyroclastic flows are extremely dangerous to human beings and their properties. As a result, evacuation is the most effective strategy for avoiding casualties in the path of pyroclastic flows.
The development of community-based preparedness plans can help to reduce the risk of harm to the residents of nearby cities or towns. These preparedness plans can help to decrease the chances of people being caught unaware by eruptions and pyroclastic flows. In addition to evacuation, it is critical to locate towns and cities away from areas prone to pyroclastic flows, as well as to prepare for the likelihood of pyroclastic flows in nearby regions.
To know more about pyroclastic flows refer here:
https://brainly.com/question/30585052#
#SPJ11
Light travels extremely fast through the universe. However, the speed of light is limited to about
300,000 km/s. Because of that, it takes sunlight 8. 3 minutes to reach the Earth. How long does it take light from the Sun’s surface to reach Mars (223 million km distance to the
Sun), Jupiter (777 million km) and Pluto (5,906 million km), respectively?
It takes light about 12.4 minutes to reach Mars, 43.2 minutes to reach Jupiter, and 5.5 hours to reach Pluto, respectively, from the surface of the Sun.
To calculate the time it takes for light to travel from the Sun to a planet, we can use the formula:
time = distance/speed of light
For Mars:
time = 223,000,000 km / 300,000 km/s = 743 seconds or 12.4 minutes
For Jupiter:
time = 777,000,000 km / 300,000 km/s = 2,590 seconds or 43.2 minutes
For Pluto:
time = 5,906,000,000 km / 300,000 km/s = 19,687 seconds or 328.1 minutes or 5.5 hours
Learn more about the speed of light at
https://brainly.com/question/3978025
#SPJ4
What happens when meteoroids hit the earth's surface? what occurs if they don't? what is it called if they reach the earth's surface?
Answer: When a meteoroid enters the Earth's atmosphere, it will typically burn up and disintegrate due to the heat generated by friction with the air. The resulting visible streak of light is called a meteor or shooting star.
If the meteoroid is large enough, it may survive the fiery descent and reach the Earth's surface. In this case, it is called a meteorite. The impact of a meteorite with the Earth's surface can cause various effects, depending on the size and speed of the meteorite, and the type of terrain it impacts.
the soil horizon containing only organic material is the a horizon. b horizon. c horizon. o horizon. e horizon.
The soil horizon containing only organic material is the O horizon.
What is the O horizon?
The O horizon, which is the soil layer containing the most organic matter, is also known as the organic layer. The organic layer includes both live and dead plant roots and decomposed plant and animal residues.
This horizon can be very thin in some soils or as much as several meters thick in some organic soils. Because of its abundance of organic matter, the O horizon is often dark in color and has a spongy texture. This soil layer is sometimes known as the surface layer.The O horizon is found in soils that have experienced natural soil formation over a long period of time. The development of this layer of soil is affected by a variety of factors, including climate, vegetation, and the underlying bedrock, which all play a role in soil development. The soil's pH level and other chemical properties can also affect the amount of organic matter present in the O horizon. Additionally, human activity can affect the development and composition of this soil layer.
To know more about O horizon refer here:
https://brainly.com/question/2289134
#SPJ11
QUESTION 2 DOK 2 1 ALIGNED STANDARD 5 points
Why does Paul Krugman's statement "Apocalypse will
become the new normal" seem likely to be true?
SELECT AN ANSWER
Countries are doing very little to confront climate
change and have instead decided that climate change
is just normal.
Devastating natural disasters, such as out-of-control
wildfires and historic flooding, seem to be happening
somewhere every year.
Climate change is occurring throughout the world and
people have just come to accept that the climate is
changing.
Every country has had to deal with a historic natural
disaster every year since the 21st century began.
The reason why Paul Krugman's statement "Apocalypse will become the new normal" seems likely to be true is that devastating natural disasters, such as wildfires, flooding, and hurricanes, have become more frequent and intense due to climate change. Option 2 is the answer.
Who is Paul Krugman and what is an apocalypse?Paul Krugman is an American economist and columnist. He is a professor of economics at the Graduate Center of the City University of New York, a Distinguished Scholar at the Luxembourg Income Study Center at the University of Luxembourg, and a columnist for The New York Times.
Apocalypse generally refers to a catastrophic event that results in widespread destruction or the end of the world as we know it. In the context of climate change, it can refer to a scenario in which the effects of climate change, such as extreme weather events, sea level rise, and food and water shortages, become so severe that they threaten human civilization and the natural world.
Learn more on climate change here https://brainly.com/question/1789619
#SPJ1
is this statement true or false?the rio grande river serves as a physical divider between mexico and canada.
The statement "the rio grandee river serves as a physical divider between Mexico and Canada" is false because the Rio Grande is a river that runs from southern Colorado through New Mexico to the Gulf of Mexico.
The river is over 3,000 kilometers long, making it the fourth-longest river in the United States. The Rio Grande river forms a natural border between the United States and Mexico.
However, it does not divide the United States from Canada. So, the given statement "the rio grande river serves as a physical divider between Mexico and Canada" is false.
Conclusion: The statement "the rio grande river serves as a physical divider between Mexico and Canada" is false.
For such more question on Gulf of Mexico:
https://brainly.com/question/14304019
#SPJ11
what distinguishes the imagery in the chauvet cave from that of the great gallery in horseshoe canyon?
The imagery of the Chauvet Cave and the Great Gallery in Horseshoe Canyon differ in terms of style, medium, and purpose. The Chauvet Cave art is more representational and stylized, and is drawn or outlined, while the Great Gallery art is more abstract and expressionistic, and is painted with plant pigments and minerals.
The Chauvet Cave and the Great Gallery in Horseshoe Canyon both feature prehistoric artwork, however there are some distinct differences in the imagery. The Chauvet Cave features animal paintings such as mammoths, rhinoceroses, and bears, which are in shades of red, black, and white.
The Great Gallery, on the other hand, is made up of hand prints and abstract symbols and figures, and is in shades of red and yellow. The Chauvet Cave artwork appears to be more representational and stylized, while the Great Gallery artwork is more abstract and expressionistic.
The most striking difference between the two is the medium used for the artwork. The Chauvet Cave images are mostly drawn and outlined, while the Great Gallery art is created using paint made from plant pigments and minerals. This is likely due to the limited availability of natural light in the Chauvet Cave, which made it difficult to mix pigments and use other painting techniques.
Finally, the purpose of the artwork is also different between the two sites. While the Chauvet Cave is thought to have been used for ceremonial purposes, the Great Gallery is thought to have served as a way of marking a hunting territory or ritual pathway.
Know more about Chauvet Cave here:
https://brainly.com/question/29348049
#SPJ11
during metamorphism, would you expect to find aligned, flattened grains in a rock that has undergone heating but has not been subjected to differential stress? why?
Aligned and flattened grains are typically found in a rock that has been subjected to differential stress, rather than in a rock that has undergone heating but has not been subjected to differential stress.
During metamorphism, this is a key difference. Differential stress is defined as stress that is not applied uniformly in all directions, whereas uniform stress is stress that is applied uniformly in all directions. In a rock that has been subjected to differential stress, aligned and flattened grains would be expected because the pressure is not distributed uniformly, which causes the grains to align perpendicular to the direction of stress.
Heating alone will not cause grains to align in this manner because there is no directional stress that causes the grains to move or rotate, and the rock is typically subjected to uniform heating in all directions.
Therefore, the grains will not align or flatten, and instead will maintain their original position and shape. In summary, aligned, flattened grains are typically found in a rock that has been subjected to differential stress, rather than in a rock that has undergone heating but has not been subjected to differential stress. During metamorphism, this is a key difference.
To know more about metamorphism click on below link:
https://brainly.com/question/1100440#
#SPJ11
not all earthquakes are preceded by foreshocks. not all earthquakes are preceded by foreshocks. true false
The statement "Not all earthquakes are preceded by foreshocks, and in some cases, no foreshock is observed before the main shock." is true.
Foreshocks are smaller earthquakes that occur before the main shock and are caused by the same fault, but the intensity of foreshocks is much lower than the main shock.
These foreshocks can occur from minutes to days before the main earthquake.
It is important for people living in earthquake-prone areas to be prepared and have an emergency plan in place to minimize the impact of earthquakes when they do occur, regardless of whether or not foreshocks were detected beforehand.
To know about Foreshocks refer here:
https://brainly.com/question/6843834
#SPJ11