Environmental Crossword

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Across
  1. 6. To guarantee, to make sure.
  2. 7. If something is this, it can be used again.
  3. 9. Get rid of.
  4. 10. Having power and ability
  5. 12. The solid surface on the earth.
Down
  1. 1. A hot, dry, sandy region with little or no rain.
  2. 2. Any pieces, fragments, etc, that are left after use.
  3. 3. The top or outside part of something.
  4. 4. A opening through something.
  5. 5. To make something necessary.
  6. 8. To catch by a trick or to close or confine in a cage.
  7. 11. When something in put into the ground.