The rapid downhill movement of a large amount of soil and rocks
landslide
process of water in and around rocks and soil freezing and expanding, breaking up rocks
Frost Weathering
Volcanoes and earthquakes can push land...
upward
Explain how a volcano can form an island
A volcano is a crack in the surface of the earth through which lava flows. During an eruption, lava and rocks are forced out of the earth, forming an island.
occurs when water or wind gradually wears away rock by friction
abrasion
The three sizes of weathered rock found in soil are...
sand, silt, and clay
Two ways that the activities of people can cause erosion...
Removing plants can increase the amount of topsoil that erodes. Paved areas cause water to run off into surrounding soil and can cause that soil to erode.
Sediment that is deposited at the mouth of the river makes the mouth of the river...
shallower
The moving of bits of weathered material from one place to another is called...
erosion
Mountains and dunes are two types of...
landforms
A moraine is a hill formed by a ...
glacier
The layer that is made of solid, unweathered rocks under layers of soil is called...
bedrock
True or False: Erosion always happens quickly.
False
Three things that can cause rocks to weather are...
wind, water, and plants.
Two kinds of sudden erosion caused by gravity are...
landslides and avalanches
a sudden downhill movement of a large amount of snow and ice.
avalanche
An area of sediment that builds up at the mouth of a river is called...
delta
Small bits of weathered rock and other material are called...
sediment
The dropping of sediment in a new place is called...
deposition
The soil layer that is mostly coarse, weathered rocks and does not contain humus is the...
subsoil
True or False: U-shaped valleys where pond and lakes form can be caused by glaciers.
True
The layer of soil that contains humus is called...
topsoil
The process of breaking down rocks into smaller pieces is called...
weathering
a huge sheet of ice that stays frozen all year
glacier
True or False: Decayed plant and animal material in soil is called sediment.
False
The layer in which most plants grow is called...
topsoil
True or False: Glaciers can pick up sediment and rocks.
True
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