Plate cross

4. the geological process in which a continent moves across the earth in a matter of centimeters per year
6. the type of plate boundary where soft solid rock comes up from the mantle to fill a gap between plates
7. the outer layer of the earth about 22 miles deep under the continental crust and 6 miles deep under the oceans crust
9. the type of plate boundary where one plate slides by another plate
12. how often or fast something happens
13. the central portion of the earth which is believed to be composed mainly of molten iron and molten nickel
15. to examine in detail for a purpose
16. the type of plate boundary where one plate goes under the other
18. one of the very large sections of solid rock that make up earths outer layer
19. the forces or conditions within the earth that cause movements of earths plates
20. one of the main landmasses of the globe

1. the crust and upper mantle of the earth
2. the transfer of heat by the circulation or movement of the heated parts of a liquid or gas
3. something we observe to happen over and over
5. the process by which collision of the earths plates results in one plates being drawn down or overridden by another
8. a mountain or hill usually having a cuplike crater at the summit in which expels ash and lava
10. a type of valley thats formed by plate motion
11. a series of vibrations induced in the earth's crust by the abrupt rupture of rocks in which strain had slowly accumulated
14. the landmass that existed when all continents were joined from about 300 to 200 million years ago
17. the layer of soft solid rock under the crust