Crossword

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Across
  1. 4. Ground
  2. 5. Gas that causes global warming
  3. 6. all life on earth
  4. 7. Air
  5. 9. the cycle that water moves around in
Down
  1. 1. Sphere of water
  2. 2. Planet we live in
  3. 3. Outer layer of the earth
  4. 5. inner layer of the earth
  5. 8. thing that produces heat