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Weathering and Soil Erosion
Chapter 7 Key Terms
23
Science
7th Grade
12/04/2006

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Term
Erosion
Definition
is the movement of rock perticles by wind, water, ice, or gravity.
Term
(Physical) Mechanical Weathering
Definition
is the type of weathering in which rock is physically broken into smaller pieces of rock.
Term
Abrasion
Definition
is the grinding away of rock by rock pertcales carried by water, ice, wind, or gravity.
Term
Ice Wedging
Definition
is when water seeps into cracks in the rock and frezzes, which then expands breaking the rock into the rock more. Then the water melts and the whole process repeats.
Term
Chemical Weathering
Definition
is the process that breaks down rock through Chemical Changes.
Term
Permeable
Definition
is a material full of tiny connected air spaces that alloe water to seep through it.
Term
Soil
Definition
is the loose weathered material on Earth's surface that polants can grow.
Term
Bedrock
Definition
is the soild layer of rock beneath soil.
Term
Humus
Definition
is a dark-colored substance that forms as plant and animal remains decay.
Term
Loam
Definition
is soil that is made up of equal parts ofclay, sand, and silt.
Term
Soil Horizon
Definition
is a layer of soil that differs in color and texture from the layer above or below.
Term
Loam
Definition
is soil that is made up of equal parts ofclay, sand, and silt.
Term
Topsoil
Definition
is a crumbly dark brown soil that is a mixture of humus, clay, and other materials.
Term
Subsoil
Definition
usally consists of clay and other particales washed down from the horizon, but little humus.
Term
Litter
Definition
is sheded leaves from plants that forms a loose layer.
Term
Decomposers
Definition
are the organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals.
Term
Sod
Definition
is a thick amass of tough roots at the surface of the soil.
Term
Renewable Resource
Definition
is one that is naturally replaced in reletively short time.
Term
Dust Bowl
Definition
was an area where wind erosion caused severe loss of topsoil during the 1930's.
Term
Soil Conservation
Definition
is the management of soil to prevent its destruction.
Term
Contour Plowing
Definition
is the practice of plowing fields along the curves of a slope.
Term
Conservation Plowing
Definition
is when people disturbs the soil and its palnt cover as little as possible.
Term
weathering
Definition
the process that breaks down rock.
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