Math/science crossword puzzle-Brittany

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Across
  1. 5. when something repeats itself
  2. 11. a number that its value is less the zero
  3. 12. a sudden and violent shaking on the ground
  4. 13. a large solid area of land
  5. 14. when two plates move toward each other and collide
  6. 17. the super continent that broke apart
  7. 19. the calendar for events in earths history
  8. 20. answer a math question
  9. 22. the earths outermost layer
Down
  1. 1. making something into a smaller number
  2. 2. large slab of rocks that divide earths crust
  3. 3. a numerical quantity that is not a whole number
  4. 4. information that supports the main idea
  5. 6. when two plates move away from each other
  6. 7. the second largest continent
  7. 8. the earths surface that is cracked into large pieces
  8. 9. a number that is greater then zero
  9. 10. the very hot,very dense center of our planet
  10. 15. make smaller in size or number
  11. 16. the widest layer of the earth
  12. 18. extremely deep valleys just in the ocean instead on land
  13. 21. the remains of an extinct animal