Christian's cross word puzzle

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Across
  1. 3. the planet we live on
  2. 5. areas near the equator that are really warm
  3. 8. something that comes from clouds
  4. 9. a
  5. 10. the lowest layer of the atmosphere
  6. 11. an invisible line that runs through the middle of earth
Down
  1. 1. living things in a environment
  2. 2. nonliving things in a environment
  3. 3. the study of the interactions of living organisms with one another and with their environment
  4. 4. angular distance from the equator measured in degrees
  5. 6. invisible vertical lines that runs around the earth
  6. 7. a mixture of gases that surrounds a planet or moon