Geography crossword

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Across
  1. 3. the subject this crossword is based on
  2. 7. big pointy rocks that almost reach space
  3. 8. a large amount of water that separates continents
  4. 10. a stream of flowing water
  5. 11. how hot or cold it is
  6. 12. an overflow of water that devastates anything
  7. 13. a mainland contrasted with islands
  8. 14. land where people live
  9. 17. another name for the earth
  10. 18. where everything lives
Down
  1. 1. some one who studies the earth and its surface
  2. 2. a fall of rain
  3. 4. of or relating to glaciers
  4. 5. light in a storm, sometimes dangerous
  5. 6. hot and spews lava
  6. 9. an amount of people
  7. 13. like white things in the sky
  8. 15. not living but naturally formed
  9. 16. a bunch of questions that are asked and compulsory to answer
  10. 19. when water freezes and then falls from clouds