geo, terr, pry, aer

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Across
  1. 3. abnormal desire to start fires
  2. 9. fire stone
  3. 10. living on land; occurring or relating to earth
  4. 11. put air into
  5. 12. shape that reduces drag
Down
  1. 1. fragments of rock from volcano explosion
  2. 2. study if rocks
  3. 4. requires oxygen
  4. 5. spray can
  5. 6. stone filled with crystals
  6. 7. fireworks display
  7. 8. land divided into countries
  8. 10. piece of land
  9. 11. nest of a bird high up on a mountain or cliff