Plate Tectonics

4. continents moved slowly to their current location
5. the layer of earth on which the crust floats
9. seven great land masses on the globe
10. supercontinent that incorporated almost all of Earth's landmasses in early geologic time
14. is a region where plates meet
15. the strong, lower part of the mantle between the asthenosphere and the outer core
16. the plastic-like layer below the lithosphere
17. the thin, outer surface of the earth
18. is the process in which the ocean floor is extended when two plates move apart
19. when denser rock is pushed down into the mantle so that it melts back into magma
20. very dense type of crust

1. it is the largest of all tectonic plates
2. boundary where plates slide past each other horizontally along transform faults
3. plates that move apart
6. current in Earth's mantle that transfers heat in earths interior and is the driving force for plate tectonics
7. plate boundaries where two plates come together
8. it is made up of two parts – the crust and the rigid upper part of the mantle
11. the innermost layer of the earth
12. Earth's crust and part of the upper mantle are broken into sections
13. portion of the Earth's crust that lies beneath the ocean floor