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Chapter 4 Science
Lesson 1 Conserving Land and Soil
Question | Answer |
---|---|
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 |