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earth ch.2

TermDefinition
uniformitarianism the geologic record that shows where rock layers have been lost due to erosion
erosion the process by which water.ice,wind,or gravity moves weathered particles of rock and soil
weathering the chemical and physical process that break down rock and other substances
mechanical weathering the type of weathering in which rock is physically broken into smaller pecies
chemical weathering the process that breaks down rock through chemical changes
abrasion the grinding away of rock by other rock particles carried by water,ice , or wind
frost wedging process that splits rocks when water seeps into cracks and then freezes and expands
oxidation a chemical change in which a substance combines with oxgen as when iron oxidizes forming rust.
permeable characteristic of material that contains connected air spaces or pores,that water can seep through easily
bedrock rock that makes up earths crust solid rock layer
decomposer a organism that gets energy from dead organisms
fertility a measure of how well soil supports plant growth
humus dark colored organic material in soil
loam rich fertile soil that is made up of about equal parts of materials
ph scale measures acidity
soil the loose,weathered material on earths surface in which plants can grow
soil horizon a layer that differs in color and texture and composition
subsoil consists of clay and other rock partials little humus
topsoil crumbly dark brown soil that is a mixture of humus clat and other minerals
natural reasource is anything in the environment that humans use
soil conservstion the management of soil to limit its destruction
crop rotation a farmer plants different crops in a field each year
contour plowing farmers plow their fields along the curves of a slope instead of straight rows
conservation plowing dead weeds and crops are tilled into the soil
Created by: jac201020918
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