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Weathering and Soil Erosion
Chapter 7
17
Science
7th Grade
12/04/2006

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Term
Weathering
Definition
the process that breaks down rock and other substances at earth's surface
Term
Mechanical Weathering (Physical Weathering)
Definition
The type of weathering where rock is physically broken
Term
abrasion
Definition
grinding away of rock by rock particles carried by water,ice,wind or gravity.
Term
ice wedging
Definition
the process that splits rock when water seeps into cracks, then frezzes and expands.
Term
Chemical weathering
Definition
the process that breaks down rocks through chemical changes
Term
Permeable
Definition
tiny holes in rock that let water seep through it
Term
soil
Definition
the lose weathered material on earth's surface
Term
bedrock
Definition
the solid layer of rock beneath the soil
Term
humus
Definition
the decayed organic material in soil.
Term
loam
Definition
soil that is made up of equal amounts of clay sand and silt
Term
soil horizon
Definition
layer of soil that differs in color and texture from the layer above or below it
Term
topsoil
Definition
a crumbly, dark brown soil that is a mixture of humus, clay and other materials
Term
sub soil
Definition
usually consists of clay and other materials but little humus
Term
Erosion
Definition
The process by which natural forces move weathered rock and soil from one place to another.
Term
Sediment
Definition
material moved by erosion
Term
Deposition
Definition
when the agents of erosion lay down sediment
Term
Mass movement
Definition
When alot of soil and other stuff move to a different position
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