Unit 3 Vocab

4. a long, narrow, deep depression on the ocean floor
7. the stress that causes plates to slide past each other
9. top-most layer of the Earth, composed of both the crust and the portion of the upper mantle that behaves as a brittle, rigid solid.
11. created when plates move away from each other
13. an underwater mountain, usually volcanic
14. created when plates slide past each other

1. created when plates move towards each other
2. the solid upper layer of the Earth's mantle, that is so hot that it behaves plastically and can flow. Convection currents occur here and move the lithospheric plates above.
3. ring-shaped coral reef, encircling a shallow lagoon
5. the stress that causes plates to be pushed towards each other
6. the steep decline from the continental shelf to the ocean floor
8. an underwater mudslide of sediments
10. a seamount whose top has been eroded flat by wave action, and then subsides
12. the stress that causes plates to be pulled away from each other