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weathering and soil formation
chapter 7
25
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
erosion
Definition
The movement of rock particles by wind, water, ice, or gravity.
Term
mechanical weathering
Definition
The type of weathering in which rock is physically broken into smaller pieces.
Term
abrasion
Definition
The grinding away of rock particles carried by water, ice, wind, or gravity.
Term
ice wedging
Definition
The process that splits rock when water seeps into cracks, then freezes and expands.
Term
chemical weathering
Definition
The process that breaks down rock through chemical changes.
Term
permeable
Definition
Full of tiny holes, connected air spaces that allow water to seep through it.
Term
soil
Definition
The loose, weathered materials on Earth's surface in which plants can grow.
Term
bedrock
Definition
The solid layer of rock beneath the soil.
Term
humus
Definition
A dark colored substance that forms as plant and animal remains decay.
Term
loam
Definition
Soil that is made up of about equal parts of clay, sand, and silt.
Term
soil horizon
Definition
A layer of soil that differs in color and texture from the layers above or below it.
Term
topsoil
Definition
A crumbly, dark brown soil that is a mixture of humus, clay, and other materials.
Term
subsoil
Definition
Consists of clay and other particles washed down from the A horizon, but little humus.
Term
decomposers
Definition
The organisms that break the remains of dead organims into smaller pieces and digest them with chemicals.
Term
sod
Definition
The thick mass of tough roots at the surface of the soil.
Term
renewable resource
Definition
One that is naturally replaced in a relatively short time.
Term
dust bowl
Definition
An area where wind erosion caused severe loss of topsoil during the 1930s.
Term
soil conservation
Definition
The management of soil to prevent its destruction.
Term
contour plowing
Definition
The practice of plowing fields along curves of a slope.
Term
conservation plowing
Definition
Diturbs the soil and its plant cover as little as possible.
Term
What factors cause mechanical weathering?
Definition
Freezing, thawing, growth of plants, and actions of animals.
Term
Describe three causes of chemical weathering.
Definition
Acid rain, living organisms, and water.
Term
What factors affect the rate of weathering?
Definition
Heat, cold, water, and ice.
Term
Explain why chemical weathering occurs faster in hot, wet climates than in cold, dry climates.
Definition
Chemical weathering has more agents than mechanical weathering.
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