Across
- 3. a set of interacting parts forming a complex whole
- 6. the layer of soft solid rock underneath earths plates
- 9. something that happens over and over again
- 10. how often or fast something happens
- 11. a very large section of earths hard solid rock layer
- 12. any of the many processes (such as eruptions)in which has and lava are pushed to the surface of earth
- 15. an object or diagram that helps us understand something by making it easier
- 16. an underwater mountain range formed when two plates move apart
- 18. how many different plate boundaries are there
- 20. a trench is formed at this plate boundary
Down
- 1. one of earths layers made of hard solid rock
- 2. the place where two plates meet
- 4. A diagram that shows the inside of something
- 5. a mid ocean ridge is formed at this plate boundary
- 7. they introduced the continental drift theory
- 8. a sudden shaking of earths surface
- 13. is an explanation of a scientific process that has been successfully tested in many different ways
- 14. to examine in detail for a purpose
- 17. any of earths main continuous areas of land such as Africa and North America
- 19. a long deep indentation in the ocean floor formed when two plates move together