Plate Tectonics

2. A single landmass that broke apart 200 million years ago
4. Transfer of heat between a material
5. The transfer of heat by movement of a fluid
6. vibrations that carry the energy released in an earthquake
8. Rigid layer made up of the upper part of the mantle and crust
13. Valley that forms where plates move apart.
14. Transfer of heat through space
16. sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
17. A trace of an ancient organism that has been preserved in a rock
19. Layer of molten iron and nickel that surrounds the inner core of Earth
20. A break in Earth's crust where masses of rock slip past each other

1. A section of the lithosphere that slowly moves over the
3. carrying pieces of continental and oceanic crust
7. A dense sphere of iron and nickel at the middle of earth
9. The process by which oceanic
10. A device that determines the distance of an object under water by recording echos of sound waves
11. Layer of hot,solid material between Earth's crust and core
12. Hypothesized that Earths continents moved
15. The amount in a given space
18. force pressing on an area