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100
Weathering
What is the chemical and physical process that break down rock at Earth's surface?
100
Soil
What is the loose, weathered material on Earth's surface in which plants can grow?
100
Sod
What is a thick mass of grass roots and soil?
100
Permeable
What is the characteristic of a material that is full of tiny, connected air spaces that water can seep through?
100
Contour Plowing
What is plowing fields along the curves of a slope to prevent soil loss?
200
Chemical Weathering
What is the process that breaks down rock through chemical changes?
200
Topsoil
What is the mixture of hummus, clay, and other minerals that forms the crumbly, topmost layer of soil?
200
Natural Resource
What is anything in the environment that humans use?
200
Hummus
What is dark colored organic material in soil?
200
Abrasion
What is the grinding away of rock by other rock particles carried by other rock particles carried in water, ice, or wind?
300
Ice Wedging
What is the process that splits rock when water seeps into cracks, then freezes and expands?
300
Subsoil
What is the layer beneath the topsoil that contains mostly clay and other minerals?
300
Crop Rotation
What is the planting of different crops in a field each year to maintain the soil's fertility?
300
Soil Conservation
What is the management of soil to prevent its destruction?
300
Bedrock
What is the solid layer of rock beneath the soil?
400
Erosion
What is the process by which water, ice, wind, or gravity moves weathered rock or soil?
400
Loam
What is rich, fertile soil that is made up of about equal parts of clay, sand, and silt?
400
Dust Bowl
What is the area of the Great Plains where wind erosion caused soil loss during the 1930's?
400
Oxidation
What is a chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust?
400
Mechanical Weathering
What is the type of weathering in which rock is physically broken into smaller pieces?
500
Uniformitarianism
What is the geologic principal that the same geologic process that operate today operated in the past to change Earth's surface?
500
Decomposer
What is soil organism that breaks down the remains of organisms and digests them?
500
Conservation Plowing
What is soil conservation method in which the dead stalks from
500
Fertility
What is a measure of how well soil supports plant growth?
500
Soil Horizon
What is the layer of soil that differs in color and texture from the layers above or below it?
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