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Vocabulary

Chapter 8

TermDefinition
weathering breaking down rock and other substances at earths suface
erosion the removal of rock particles by wind, water, ice, or gravity
uniformitarianism principle that states that the same processes that operate today operated in the past
mechanical weathering rock is physically broken down
abrasion the grinding away of rock particles carried by water, ice, wind, or gravity
ice wedging water seeps into a crack and freezes then the crack gets bigger and the water thaws and happens again
chemical weathering breaking down rock through chemical changes
oxidation iron combines with oxygen in the presence of water in water
permeable means that a material is full tiny connected air spaces that allow water to seep through it
soil lose weathered material on earths surface in which a plant might grow
bedrock a solid layer of rock beneath the soil
humus a dark-colored substance that forms as plants and animals decay
fertility is the measure of how well the soil supports plant growth
loam soil that is made up of about equal parts of clay sand and silt
topsoil a crumbly dark brown soil that is made of humus clay and other material
subsoil consists of clay and other particles washed down from the a horizon but little humus
litter plants die their remains fall to the ground and become the litter
decomposers the organisms that break down the remains of dead organisms into smaller pieces and digest them
sod is he thick mass of tough roots at the surface of the soil
natural resoure anything in the enviornment that humans can use
dust bowl the area of the great plains were wind erosion caused soil loss
soil conservation is the management of soil to prevent its destruction contour plowing,and conservation and crop rotation are examples
Created by: Chandler Edbauer
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