3.7B Rapid Changes to Earth 2

Which of the following is a correct definition of a landslide?

• A violent shaking of the ground caused by movements deep in the Earth’s crust

• An opening in the Earth’s crust that allows magma to reach the surface

• The rapid downward movement of large amounts of rock, soil or mud

• A tropical cyclone with wind speeds reaching over 120 kilometers per hour

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What is a tsunami?

• A violent, rotating storm system with wind speeds over 120 kilometers per hour

• A large ocean wave, or series of waves, that strikes land

• A rotating column of air that moves along the ground

• Overflow of water from a river, lake or stream; often caused by heavy rainfall

All of the following events can cause a tsunami except –

• hurricanes

• landslide

• volcanic eruption

• earthquake

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Which of the following does NOT normally result from a landslide?

• Destruction of land

• Violent storms

• Loss of life

• Flooding

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All of the following are other names you may hear used for a landslide except –

• mudslide

• rockfall

• avalanche

• waterslide

Which of the following is a warning sign that a tsunami might be approaching the shore?

• Strong winds and violent thunderstorms

• Rising sea levels and very dark storm clouds

• Ocean water recedes, exposing the ocean floor, reefs and stranded aquatic life

• A dark greenish sky and hail storms

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Which of the following is a sign that a landslide may be starting?

• New cracks in driveways or sidewalks

• Doors and windows jam or stick

• Sounds of trees cracking or large rocks hitting together

• All of the above

A flood is –

• a violent shaking of the Earth’s crust; often occurs at or near fault lines

• overflow of water from a river, lake or stream onto land that is normally dry; often caused by heavy rainfall

• a rupture of the Earth’s crust; can cause lava to flow out onto the surrounding land

• when large amounts of soil or rocks is moved downhill at a fast rate

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Which of the following natural events does NOT cause rapid changes to the surface of the Earth?

• Volcanic eruptions

• Earthquakes

• Landslides

• Weathering and erosion

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The world’s largest landslide in modern history occurred during the 1980 eruption of Mount St. Helen in Washington. Why do you think landslides often follow or happen during volcanic eruptions?

• The steep sides of a volcano are weakened by the volcanic eruption.

• The lava melts other rocks and causes landslides.

• It is common for natural disasters to occur at the same time, but they not related.

• The landslide causes the volcanic eruption.

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