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Science Project Ch 6

By Jin Na

QuestionAnswer
weathering chemically or physically wearing down rock on Earth's surface.
erosion The process where water, winds, ice, or gravity moves weathered rock or soil.
uniformitarianism the principle that the same processes happening to change Earth now has always been used.
abrasion the process of grinding sediment against rock and wearing it away.
ice wedging widening cracks in rock by water freezing and expanding inside.
chemical weathering Process that erodes rock with chemicals.
oxidation a chemical change caused by a substance mixing with oxygen.
permeable filled with tiny air spaces able to let in water.
soil loose material made of weathered rock and humus that can support plant life
natural resources material that humans obtain from the natural enviroment
bedrock a layer of hard rock under soil
humus organic material found in soil.
fertility how well soil is able to support plant life.
loam a fertile soil that is made of about equal amounts of clay, soil, and silt.
soil horizon layers of soil that are different in color and texture.
topsoil uppermost layer of loose soil made of humus, clay, and other material.
subsoil layer under topsoil made of mostly clay and other minerals.
litter a covering of decomposing plant material on top of soil.
decomposer a soil organism that breaks down dead organisms by eating them.
sod a thick mass of grass roots and soil.
Dust Bowl An area in the Great Plains where soil was dried and lost because of exposure to erosion
soil conservation preventing soil from being lost or destroyed.
Contour plowing soil conservation method of plowing along slopes.
Conservation plowing soil conservation method of leaving dead stalks from last year to hold soil in place.
crop rotaion soil conservation method of changing crops each time to balance loss and adding of nutrients.
Created by: JinNa
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