Mia's Crossword Puzzle.

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Across
  1. 1. A long,narrow groove that forms where water,lava or other liquid flows.
  2. 7. the bottom number in a fraction
  3. 10. the sphere of earth/rock
  4. 12. the sphere of air
  5. 15. scientists who study Earth
  6. 16. the sphere of water
  7. 19. a liquid that forms seas,lakes,rivers,and rain
  8. 20. a part of a whole number including a numerator and denominator.
Down
  1. 2. where living things are able to live.
  2. 3. the sphere of life
  3. 4. a comparison of two quantities
  4. 5. the planet known as the red planet
  5. 6. the biggest gas planet
  6. 8. the top number in a fraction
  7. 9. the size,length,or amount of something
  8. 11. the planet closest to the sun
  9. 13. A group of parts that interact.
  10. 14. planet planets made of helium/hydrogen
  11. 17. planet planets made of rock/with a solid surface
  12. 18. magma that emerges into liquid and comes out of a volcano