Living Things and Their Environments

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Across
  1. 4. The layer of air and gasses surrounding Earth is the…
  2. 5. There is less than 3% of ____________ on Earth.
  3. 6. Rocks, water, and air are ___________ factors.
  4. 8. "bio" means ____________.
  5. 9. Biotic factors are _____________ things.
  6. 10. The biosphere is as thick as the skin on an ____________.
  7. 14. 21% of the atmosphere is made up of…
  8. 15. What is both a biotic factor and an abiotic factor?
  9. 16. The part of Earth where all living things exist is the…
  10. 18. There are four __________ on Earth.
Down
  1. 1. "Hydro" means __________.
  2. 2. People, plants, and animals are _________ factors.
  3. 3. .04% of the atmosphere is made up of…
  4. 7. All the water on Earth is part of the…
  5. 11. The land and rock in Earth's crust is part of the…
  6. 12. Abiotic factors are ______________ things.
  7. 13. 78% of the atmosphere is made up of…
  8. 17. There is more than 97% of ____________ on Earth.