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chapter 8 key terms

What is weathering? The chemical and physical process that breaks down rock at earth's surface.
What is erosion? The process by which water, ice, wind, or gravity.
What is uniformitarianism? The geologic principal that the same geologic process that operate today operated in the past to change earth's surface.
What is mechanical weathing? The type of weathing in which rock is physically broken into smaller.
What is an abrasion? The grinding away of rock by other rock particles carried in water, ice, or wind.
What is ice wedging? Proces that splits rock when water seeps into cracks, then freezes and expands.
What is chemical weathering? The process that breaks down rock through chemical changes.
What is oxidation? A chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust.
What is permeable? Characteristics of a material that is full of tiny, connected air spaces that water seeps through.
What is soil? The loose, weathered material on earth's surface in which plants can grow.
What is bedrock? The solid layer of rock beneath the soil.
What is humus? Dark-colored organic material in soil.
What is fertilty? A measurment of how well soil supports plants growth.
What is loam? Rich, fertile soil that is made up of loam about equal parts of clay, sand, and silt.
What is soil horizon? The layer of soil that differs in color and texture from the layers above and below it.
What is the topsoil? Mixture of humus, clay, and other minerals that forms the crumbly, top most layers of soil.
What is the subsoil? The layer of soil beneath the topsoilthat contains mostly clay and other materials
What is the litter? The loose layer of dead plants leaves and stems on the surface of the soil
What is a decomposre? Soil organism that breaks down the remains of organisms and and digest them
What is sod? A thick mass of grass and soil
What are natural resoures? Anything in the enviroment that humans use
What is the Dust bowl? The area of the great plains where wind erosion caused soil loss during the 1930s
What is soil conservation? The management of of soil to prevent its destuction
What is contour plowing? Plowing fields along the curves of a slope to preventsoil loss
What is conservation plowing? Soil plowing method in which the dead stalks from the previous year's crop are left in the ground to hold the soil in place
Created by: LilKae101