Soil

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Across
  1. 2. a loose mixture of small rock fragments, organic matter, water, and air that support the growth of vegetation.
  2. 5. decayed organic matter, which adds nutrients to soil.
  3. 7. upper soil layer which contains sediment mixed with humus; best for plant growth.
  4. 10. the movement of soil and rock from one location to another.
  5. 12. dead weeds and stalks from the previous year's crop are plowed into the ground to return nutrients and help hold soil in place.
  6. 14. farmers plow their fields along the curves of a slope instead of straight rows. this helps prevent soil from washing away.
  7. 15. an event that happened in American history, where a combination of factors (drought and improper farming techniques) led to the destruction of soil.
Down
  1. 1. layer of soil under the topsoil; does not contain many nutrients, not good for growing plants
  2. 2. a vertical section of soil that shows all of the different layers.
  3. 3. an individual layer in a soil profile, which has its own unique physical properties.
  4. 4. the process where rock is broken down into small fragments
  5. 6. small rock fragments that make up a part of soil.
  6. 8. an organism, whose tunneling actions allow air and water to enter soil.
  7. 9. large grain sediment found in soil, which allows water to drain quickly.
  8. 11. farmers plant different crops in a field each year.
  9. 13. trees planted in lines along crop fields to prevent wind from blowing away the soil
  10. 14. fine-grain sediment found in soil, which does not allow water to drain quickly.
  11. 16. the solid rock layer under the layers of looser materials and soil on the earth's surface