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Weathering and sol formation
chapter 7 key terms
18
Science
7th Grade
12/04/2006

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Term
Weathering
Definition
is the processthat breaks downrock and other substancesat earths surface.
Term
erosion
Definition
is the movementof particles by wind, water, ice, or gravity.
Term
Machanical Weathering
Definition
the type of Weathering in which rock is physically broken into smaller pieces.
Term
abrasion
Definition
the grinding away of rock by rock particles carried by water, ice, wid, or gravity
Term
ice wedging
Definition
Wedges of ice in rocks widen and deepen cracks.
Term
Chemical Weathering
Definition
is the procees that brakes down rock through chemical changes.
Term
siol
Definition
is the loose, weathered material on Earth's surface in which plants can grow.
Term
bedrock
Definition
is the solid layer of rock beneath the siol.
Term
humus
Definition
is a dark colored substance that forms as a plant and animals remains decay.
Term
loam
Definition
siol that is made up of about equal parts caly, sand, and silt.
Term
soil horizon
Definition
is a layer of siol that differs in color and texture from the layers above or below it.
Term
top soil
Definition
a crumbly, darkbrown siol that is a mixture of humus, clay, and other minerals.
Term
subsoil
Definition
usually consists of clay and other particles washed down from the A horizon, but little humus.
Term
litter
Definition
plants contribute most of the organic
Term
permeable
Definition
means that a mineral is full of tiny, connected air spaces allow water to seep though it.
Term
decomposers
Definition
are orginisms that break the remains of dead orginisms into smaller pieces and digest them with chemicals.
Term
decomposers
Definition
are orginisms that break the remains of dead orginisms into smaller pieces and digest them with chemicals.
Term
decomposers
Definition
are orginisms that break the remains of dead orginisms into smaller pieces and digest them with chemicals.
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