permafrost

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Across
  1. 2. turns into water
  2. 5. ice melting underground
  3. 7. where this is happening
  4. 9. fart gas
  5. 12. the underworld
Down
  1. 1. people have discovered this with help from the permafrost
  2. 3. the planets overall temperature
  3. 4. pickaxe
  4. 6. where this is happening
  5. 8. a _____ of ice
  6. 10. kaboom
  7. 11. one of the causes of answer three