Science

2. A weak spot in the crust where magma has come to the surface.
5. section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
7. Liquid magma that reaches the surface.
8. a deep valley that forms where two plates move apart.
13. Process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundry.
14. An undersea mountain chain where new ocean floor is produced; a divergent plate boundary under the ocean.

1. Molten mixture of rock-forming substances, gases, and water from the mantle.
3. Hypothesis that the continents slowly move across Earth's surface.
4. theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.
5. the name of the single landmass that began to break apart 200 million years ago and gave rise to todays continents.
6. A break in Earths crust a long which rocks move.
9. Major belt of volcanoes that rims the Pacific Ocean.
10. The preserved remains or traces of an organism that lived in the past.
11. An area where magma from deep within the mantle melts through the crust above it.
12. measurement of how much mass of a substance is contained in a given volume.