Earth and its subsystems

Edit Answers
1234567891011121314151617181920
Across
  1. 1. Way This spiral galaxy is where the solar system is located.
  2. 4. Also called gas planets
  3. 6. Transitional boundary between the lower mantle and the outer core
  4. 11. Solid ground of Earth
  5. 12. Hottest layer of the atmosphere
  6. 14. Percent of water that is potable
  7. 17. These planets have solid surfaces and are mostly of silicate rocks and metals.
  8. 20. This hypothesis proposes that life on Earth actually began somewhere in the universe.
Down
  1. 2. Element that is the primary source of Earth's magnetic field
  2. 3. Layer that absorbs the ultraviolet radiation from the sun
  3. 5. Underground layer of water-bearing rocks
  4. 7. Densest layer of the atmosphere
  5. 8. Water found beneath Earth's surface
  6. 9. Encompasses all the waters found on Earth
  7. 10. This hypothesis presupposes that around 4.6 billion years ago, a star system was formed from a rotating gas cloud.
  8. 13. This discontinuity is the layer that divides the crust from the mantle.
  9. 15. This zone is aftually the coldest region of the atmosphere
  10. 16. Makes up all the living components on Earth
  11. 18. Spectacular display of colorful lights in the sky
  12. 19. Rocks embedded or trapped in rocks that come straight from a volcano