earth day

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Across
  1. 4. place where we live in
  2. 5. monkey to human is called?
  3. 7. develop earth and make it survivable
  4. 8. makes the atmosphere
  5. 9. place where we walk on
  6. 12. living things that produce oxygen
Down
  1. 1. reason for the melting of glaciers in the north pole
  2. 2. contains the layers of atmosphere
  3. 3. being able to develop and improve the place
  4. 6. causes the green house gases to increase
  5. 10. living things that depend on other beings for food
  6. 11. 75% of earth is made of this