core
Inner zone of the earth. It consists of a solid inner core and a liquid outer core. Compare crust, mantle.
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Chapter 10 - Geology: Processes, Hazards, and Soils
convergent plate boundary
Area where earth's lithospheric plates are pushed together. See subduction zone. Compare divergent plate boundary, transform fault.
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Conventional tillage farming
Crop cultivation method in which a planting surface is made by plowing land, breaking up the exposed soil, and then smoothing the surface. Compare conservation-tillage farming.
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contour farming
Plowing and planting across the changing slope of land, rather than in straight lines, to help retain water and reduce soil erosion.
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Conservation tillage farming
Crop cultivation in which the soil is disturbed little (minimum-tillage farming) or not at all (no-till farming) to reduce soil erosion, lower labor costs, and save energy. Compare conventional-tillage farming.
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compost
Partially decomposed organic plant and animal matter used as a soil conditioner or fertilizer.
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Commercial inorganic fertilizer
Commercially prepared mixture of plant nutrients such as nitrates, phosphates, and potassium applied to the soil to restore fertility and increase crop yields. Compare organic fertilizer.
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animal manure
Dung and urine of animals used as a form of organic fertilizer. Compare green manure.
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alley cropping
Planting of crops in strips with rows of trees or shrubs on each side.
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Agroforestry
Planting trees and crops together.
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