Weathering and Erosion

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Across
  1. 5. a loose layer of soil that consists of leaves and other plant remains
  2. 6. the process that breaks down rock and other substances at Earth's surface
  3. 8. measure of how well the soil supports plant growth
  4. 12. a layer of soil that differs in color and texture from the layers above or below it
  5. 13. farmers disturb the soil and its plant cover as little as possible and the dead crops provide nutrients for next years crops
  6. 16. anything in the environment that humans use - soil is an important one...
  7. 17. drought in the 1930's caused the Plains in the US to lose all of it s soil due to over farmning
  8. 19. the solid layer of rock beneath the soil
  9. 20. the management of soil to prevent its destruction
  10. 21. Horizon A and is made up of crumbly dark Brown soil that is a mixture of humus, clay and other minerals
  11. 22. where iron combines with oxygen in the presence of water to produce rust
  12. 23. farmer plants different crops in a different field each year because different plants absorb different nutrients
  13. 26. farmers plow fields along the curves of a slope to help water run off when it rains
Down
  1. 1. a material is full of tiny, connected air spaces that allow water to seep through it at a fast rate
  2. 2. weathering caused by a process in which rock is physically broken into smaller pieces
  3. 3. process that breaks down rock through chemical changes with the actions of water, oxygen, Co2, living organisms and acid rain
  4. 4. the removal of rock particles by wind, water, ice or gravity
  5. 7. the grinding away of rock by rock particles carried by water, ice, wind or gravity
  6. 9. organisms that break sown the remains of dead organisms into smaller pieces and digest them with chemicals
  7. 10. areas in rocks where ice freezes and thaws and eventually breaks off part of the rock
  8. 11. principle that states that the same processes that operate today operated in the past
  9. 14. a dark-colored substance that forms as plant and animal remains decay
  10. 15. B horizon - consists of clay and other particles washed down from the A Horizon
  11. 18. the thick mass of tough roots at the surface of the soil
  12. 24. soil that is made up of about equal parts clay, sand, and silt and has a crumbly texture that holds both air and water
  13. 25. the loose, weathered material on Earth's surface in which plants can grow