Life on Earth

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Across
  1. 4. The _____ is made of all the air and gases that surround Earth.
  2. 6. Oceans help keep _____ on Earth stable.
  3. 8. To have an atmosphere, a planet must have a _____ force to hold it there.
  4. 10. Earth is 93 ____ miles from the sun.
  5. 13. Earth has the right ____ for life to exist.
  6. 15. The earth has _____that make it the right place to support life.
  7. 19. The _____ can be thought of as a giant bubble.
  8. 20. Water can exist in all _____ states of matter on Earth.
Down
  1. 1. _____ of Earth is covered with water.
  2. 2. 78% of Earth's is _____.
  3. 3. Conditions for life are exactly _____ on Earth.
  4. 5. Earth's magnetic field shields Earth from harmful _____ particles.
  5. 7. We drink water in the ____ form.
  6. 9. Water is necessary for all _____ things.
  7. 11. The solid form of water is _____.
  8. 12. Life on earth is not _____ without the magnetic field
  9. 14. Earth's atmosphere containes 21% _____.
  10. 16. Some _____ have no atmosphere.
  11. 17. The third planet from the sun
  12. 18. Liquid _____ is found only on planet Earth.