Plate Tectonics

3. The layer of hot, solid material between Earth’s crust and core.
4. The hypothesis that the continents slowly move across Earth's surface
5. The process by which oceanic trench and back into the mantle at a convergent plate boundary.
8. A rigid layer made up of the uppermost part of the uppermost part of the mantle and the crust.
9. A dense sphere of solid iron and nickel at the center of Earth.
11. lithosphere are in constant motion, driven by convection currents in the mantle.
13. The name of the single landmass that began to break apart 200 million years ago and gave rise to today's continents.
17. A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
18. A layer of molten iron and nickel that surrounds the inner core of Earth.
19. The measurement of how much mass of a substance is contained in a given volume.
20. Boundary A plate boundary where two plates move past each other in opposite directions.

1. The movement of a fluid, caused by differences in temperature that transfer heat from one part of the fluid to another.
2. A deep valley that forms where two plates move apart.
6. The transfer of heat by the movement of a fluid.
7. The layer of rock that forms Earth’s outer surface.
10. A boundary where two plates move toward each other.
12. The transfer of energy by electromagnetic waves.
14. The theory that pieces of Earth's
15. The transfer of heat from one particle of matter to another.
16. The soft layer of the mantle on which the lithosphere floats.
21. is any trace of an ancient organism that has been preserved in rock.