Changes to Earth's Surface

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Across
  1. 3. to put, place
  2. 4. the fourth letter of the Greek alphabet: Δ
  3. 7. down from, away
  4. 8. out of, away from
  5. 9. middle, mid-
  6. 11. cold; to freeze
  7. 12. shape, appearance
Down
  1. 1. valley
  2. 2. after
  3. 4. day
  4. 5. before
  5. 6. to sit, settle
  6. 9. a rounded object
  7. 10. to gnaw