Happy Holidays = Science Crossword

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Across
  1. 4. this layer of the Earth makes up 85% of the Earth
  2. 9. a huge group of stars held together by gravity
  3. 10. this is made up by the upper mantle and the crust
  4. 11. the sphere of Earth that has to do with water
  5. 14. the part of Earth that has to do with rocks, land and mountains
  6. 16. to figure out this type of age, you would have to use radioactive dating
  7. 19. these boundaries move away from each other
  8. 20. friction is created at these boundaries
Down
  1. 1. the study of the order of strata that tells time
  2. 2. this state of matter is created when it is extremely hot
  3. 3. we live in this time era
  4. 5. this type of rock is made from other rocks
  5. 6. these type of rocks are formed by lava
  6. 7. rift valleys are created by these boundaries
  7. 8. creation of new crust (two words, don't put a space)
  8. 12. this part of the water cycle is when it rains
  9. 13. another word for plant eaters
  10. 15. the core of the Earth is like a solid, iron ____
  11. 17. the supercontinent that consisted of all the other ones
  12. 18. without this, gravity would cause planets to crash