Chapter 5 Vocab

3. The process by which oceanic crust sinks beneath a deep ocean trench and back into the mantle at a convergent plate boundary.
6. The theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.
7. A section of the lithosphere that slowly moves over the asthenosphere,carrying pieces of continental and oceanic crust.
10. A weak spot in the crust where magma has come to the surface.
12. The pressured remains or traces of an organism that lived in the past.
13. The theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle.
14. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean.

1. A deep valley that forms where two plates move apart.
2. The hypothesis that the continents slowly move across Earth’s surface.
3. The process by which molten material adds new oceanic crust to the ocean floor.
4. A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
5. The molten mixture of rock forming substances, gases, and water from the mantle.
8. An area where magma from deep within the mantle melts through the crust above it.
9. The transfer of energy by electromagnetic waves
11. A string of volcanoes that form as a result of subduction of one oceanic plate beneath a second oceanic plate.