Earth Science

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Across
  1. 4. The solid thickest layer of the Earth.
  2. 6. It create their own food.
  3. 8. The meaning of this word is vapor or steam.
  4. 9. He postulated the idea that the planet is formed out of nebula.
  5. 13. The totality of all the life form on Earth.
  6. 16. The northern lights is found in the _____.
  7. 17. Smallest known particle.
  8. 18. It is the outermost layer.
  9. 19. It is the lowest layer of the atmosphere.
Down
  1. 1. Carl Friedrich Von Weizsacker proposed the ________.
  2. 2. An interstellar cloud of dust and gases.
  3. 3. Negatively charged atom.
  4. 5. All the abiotic and biotic factors are found in this area.
  5. 6. The building blocks of matter.
  6. 7. It is formed of a dense interstellar cloud.
  7. 10. It is considered as the third and last boundary.
  8. 11. Gerald P. Kuiper is what kind of astronomer.
  9. 12. It slows down the meteors that enter our Earth.
  10. 14. According to _______, the sun extended the hot atmosphere throughout the solar system.
  11. 15. It is considered as a closed system.