Vocab 6

4. The layer of rock that forms Earth's outer surface
5. Tectonics The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
6. The name of the single land mass that broke apart 200 million years ago and gave rise to today's continents
8. A rigid layer made up of the uppermost part of the mantle and the crust
9. Oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary
10. The layer of hot, solid material between Earth's crust and core
11. Drift Hypothesis that continents slowly move across Earth's surface

1. A mass of hot rock that has melted into a liquid/fluid
2. The soft layer of the mantle on which the lithosphere floats
3. Spreading When molten material adds new oceanic crust to the ocean floor
4. Current The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another
7. Plates a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle