Across
- 1. evidence of life from the past
- 3. something we observe to be simpler over and over aging
- 4. a natural spring that sends hot water and steam suddenly into the air from a Joel in the ground
- 7. how often or face something is going
- 10. a feature that frames on the surface of a plant such as a mountain
- 13. the biggest core and the coldest to the sun
- 14. flows like hot and thick
- 15. an extinct reptile that lived about 300 million years ago
- 17. the outside or top layer of something
- 18. one of the very large sections of hard, solid rock that makes earths outer layer
- 20. an underwater mountain range formed when two plats move apart
Down
- 2. earths outermost layer of hared solid rock
- 5. the slow pulling apart of land that is caused by plates moving
- 6. a set of interacting parts forming a complex whole
- 8. a sudden shake in the earth
- 9. one of the layers of earth with mostly solid rock
- 10. hot liquid rock on the surface of earth
- 11. one of the cores that is the smallest and warmest
- 12. the layer of soft solid rock underneath earths plates
- 16. the core that gives the sun its shape
- 19. a Long, deep indentation in the ocean floor formed when two plates move together
