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8th Grade Science


weathering rocks are broken down into small pieces
erosion process in sediments move from one place to another by water, wind, ice, or gravity
deposition process by which sediments settle or drop out or drop out of wind or water
soil mixture of weathered sediment, organic material, water and air. Created by weathering, erosion, and deposition
humus decomposed organic matter
bedrorck solid layer of rock beneath the soil
top soil crumbly, dark brown soil that is a mixture of humus, clay, and minerals also known as soil horizon A
sub soil consists of clay and other particles washed down from the A Horizon also known as soil horizon B
soil horizon (A,B,C) layers of soil with distinct physical properties in a soil profile
pore space spaces between soil particles, water and air are found in pore spaces
soil profile vertical section showing the soil horizons (different layers)
decomposers organisms that break down the remains of dead organisms into smaller pieces and digest them with chemicals
fertility the ability a soil has to support plant life
loam soil made up of about equal parts of clay, sand, and silt
sediments loose materials such as rock fragments, mineral grains, and bits of shell
sod thick mass of tough roots at the surface of the soil
natural resource anything in the environment that humans use
soil conservation management of soil to prevent its destruction
contour plowing farmers plow their fields along the curves of a slope
conservation plowing farmers disturb soil and its plant cover as little as possible
crop rotation farmer plants different crops in a field each year
Created by: SSC 8th LA