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Weathering and soil formation
Chapter 7 key terms
22
Science
7th Grade
12/04/2006

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Term
Erosion
Definition
the movement of rock partacles by wind, water, ice, or gravity.
Term
weathering
Definition
the process that breaks down rock and other substances at earths surface.
Term
Mechanical weathering
Definition
the type of weathering in which rock is physically broken down.
Term
Abrasion
Definition
grinding away of rock by rock particals carried by water, ice, wind or gravity.
Term
ice wedging
Definition
wedges of ice in rocks widens and deepens then it cracks
Term
chemical weathering
Definition
process that breaks down rock through chemical weathering.
Term
permeable
Definition
the material is full of tiny, connectedair spaces that alow water to seep through it
Term
soil
Definition
lose weatherd material earths surface in wich plants can grow
Term
Bedrock
Definition
soil layer of rock under the soil.
Term
humus
Definition
dark colored substance that forms as a plant and animal remains decay
Term
loam
Definition
soil that is made up about equal parts of clay, sand, and silt.
Term
soil horizon
Definition
layer of soil that differs in color and texture from layers above or below
Term
top soil
Definition
crumbly, dark brown soil that is a mixter of humus, clay, and other substances.
Term
subsoil
Definition
usualy consistis of clay and other particals washed down from the A Horizin, but little humus
Term
Litter
Definition
plants shed leaves, they form a loose layer
Term
Decomposers
Definition
Organisms that break the reamins of dead orginazims into smaller pieces and digest them with chemicals
Term
sod
Definition
thickest mass of tough roots at the surface of the soil
Term
renewable resource
Definition
one thing that is Naturally replaced in a relativty short time.
Term
dust bowl
Definition
wind erosion caused servere loss of top soil during the 1930s
Term
Soil conservation
Definition
Managemint of soil to prevent its destriction
Term
contour plowing
Definition
pratice of plowing fields along the curves of a slope.
Term
conservation plowing
Definition
disturbs the soil and its plant cover little as possible
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