Plate Tectonic's

4. When the seafloor plunges into underwater canyons, the ocean crust bends downward.
7. Breaks in the earth's crust where rocks have slipped past each other.
9. Magma reaches the surface.
11. Is an area where material from deep within Earth's mantle rises through the crust and melts the crust.
13. Where the earth's crust is breaking apart and moving away from the other side.
14. When mid ocean ridges continually add new material to the ocean floor as they push it apart. Older crust moves away from either side of the ridge.
17. Where plates move apart from one another.
18. Measure of how much mass there is in a given volume.
19. Heat transfer by the movement of fluid.
20. Where plates slide past one another.

1. Supercontinent that happened about 300 million years ago where all continents were combined.
2. Earth's solid outer shell that is broken into pieces.
3. A string of island that form from volcanoes that arise the ocean floor (follows the curve of deep ocean trench.)
5. Any trace of an ancient organism that is preserved in rock.
6. A mountain that forms in Earth's crust when molten material, or magma reaches the surface.
8. The idea that the continents moved slowly over Earth's surface. Hypothesis was made by Wegener.
10. Where plates come towards each other.
12. A major belt of volcanoes that is around the pacific Ocean.
15. Process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle.
16. Transfer of heat between materials that are touching.