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Chapter 4 Science

Lesson 1 Conserving Land and Soil

Litter The very top layer of fertile soil made of dad leaves and grass
Topsoil The crumbly, topmost layer of soil made up of clay and other minerals and humus (nutrients and decaying plant and animal matter)
Subsoil the layer of soil below topsoil that has less plant and animal matter than topsoil and contains mostly clay and other minerals
Bedrock Rock that makes up Earth's crust; also the solid rock layer beneath the soil
Erosion The process by which water, ice, wind, or gravity moves weathered particles of rock and soil
Nutrient Depletion The situation that arises when more soil nutrients are used than the decomposeres can spply
Fertilizer A substance that provides nutrients to help crops grow better
Desertification The advance of desert-like conditions into areas that previously were fertile; caused by over farming, overgrazing, drought, and climate change
Drought A long period of low precipitation
Land Reclamation The process of restoring land to a more natural, productive state
Created by: dguilliams