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Chapter 9
Weathering and Erosion
24
Science
4th Grade
08/21/2012

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Cards

Term
A hill formed by a glacier
Definition
moraine
Term
A huge river of ice moving slowly downhill
Definition
glacier
Term
Affects erosion and causes water to flow downhill
Definition
gravity
Term
An area of sediment formed at the mouth of a river
Definition
delta
Term
The weathering of rocks caused by the freezing and expanding of water in rocks
Definition
frost action
Term
Decayed plant and animal material
Definition
humus
Term
Happens when water or wind gradually wears away rock by friction
Definition
abrasion
Term
The layer in which most plants grow
Definition
topsoil
Term
Occurs when wind, water, or ice drops weathered material in a new location
Definition
deposition
Term
Sediment that is deposited at the mouth of a river makes the mouth of the river ___
Definition
shallower
Term
The layer that is made of solid, unweathered rock
Definition
bedrock
Term
Shapes of land, such as mountains, canyons, and mesas
Definition
landforms
Term
Small bits of weathered rock and other material
Definition
sediment
Term
The breaking of rock by the freezing and expanding of water
Definition
frost action
Term
A sudden downhill movement of snow and ice
Definition
avalanche
Term
The layer of soil that contains humus
Definition
topsoil
Term
A sudden downhill movement of soil and rocks
Definition
landslide
Term
The loose material on the surface of the earth
Definition
soil
Term
The moving of weathered material from one place to another
Definition
erosion
Term
The process of breaking down and changing rocks
Definition
weathering
Term
The soil layer that is mostly coarse, weathered rocks without humus
Definition
subsoil
Term
The three sizes of weathered rock found in soil
Definition
sand, silt, and clay
Term
Three things that can cause rocks to weather
Definition
1. wind
2. water
3. plants
Term
What soil is made of
Definition
weathered rock
water
air
humus
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