• Soil is a mixture of eroded rock, minerals, partly decomposed organic matter, and other materials.
  • It is essential for plant growth, so it is the foundation of terrestrial ecosystems.
  • For human purposes, soil is a nonrenewable resource.
  • It can be depleted of nutrients through careless use, and eroded by wind and water.
  • Soil must be used wisely to preserve it for the future.
  • Conservation practices include contour plowing and terracing.
  • The Dust Bowl occurred between 1933 and 1939 in Oklahoma and other southwestern U.S. states.
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