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Chapters 2-6
Structure of the Earth-SSMS
Term | Definition |
---|---|
rock cycle | the cycle in which rocks form |
rocks | consolidated or unconsolidated solid mineral matter |
mineral | a naturally occurring, inorganic solid that has a crystal structure and a definite chemical composition |
crust | the layer of rock that forms Earth's outer surface |
mantle | the layer of hot, solid material between Earth's crust and core |
bedrock | the solid layer of rock beneath the soil |
humus | dark-colored organic material in soil |
fertility | a measure of how well soil supports plant growth |
loam | rich, fertile soil that is made up of about equal parts of clay, sand, and silt |
soil horizon | the layer of soil that differs in color and texture from the layers above or below it |
topsoil | an upper layer of soil consisting of rock fragments, nutrients, water, air, and decaying plant and animal matter |
subsoil | the layer of soil beneath the topsoil that contains mostly clay and other minerals |
litter | the loose layer of dead plant leaves and stems on the surface of the soil |
decomposition | to cause something (such as dead plants and the bodies of dead animals) to be slowly destroyed and broken down by natural processes, chemicals, etc. |
contour plowing | plowing fields along the curves of a slope to prevent soil loss |
crop rotation | the planting of different crops in a field each year to maintain soil's fertility |
conservation plowing | soil conservation method in which the dead stalks from the previous year's crop are left in the ground to hold the soil into place |
sod | a thick mass of grass roots and soil |
natural resource | anything in the environment that humans use |
soil conservation | the management of soil to prevent its destruction |
earthquakes | the shaking that results from the movement of rock beneath Earth's surface |
tectonic plate theory | how scientist thought plate tectonics came about |