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