Plate Tectonics

2. The process by which oceanic
7. The transfer of heat by movement of a fluid
9. vibrations that carry the energy released in an earthquake
11. Valley that forms where plates move apart.
13. A trace of an ancient organism that has been preserved in a rock
14. A single landmass that broke apart 200 million years ago
15. Layer of hot,solid material between Earth's crust and core
17. Layer of molten iron and nickel that surrounds the inner core of Earth
19. Hypothesized that Earths continents moved
20. A device that determines the distance of an object under water by recording echos of sound waves

1. carrying pieces of continental and oceanic crust
3. The amount in a given space
4. sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
5. A section of the lithosphere that slowly moves over the
6. Transfer of heat between a material
8. Rigid layer made up of the upper part of the mantle and crust
10. A break in Earth's crust where masses of rock slip past each other
12. A dense sphere of iron and nickel at the middle of earth
16. force pressing on an area
18. Transfer of heat through space