Plates and Tectonics

4. a layer inside a planetary body bounded below by a core and above by a crust
7. the uppermost layer of the oceanic portion of the tectonic plates
9. the third layer of the Earth. It is the only liquid layer
10. the relatively thick part of the earth's crust that forms the large landmasses
11. an area of volcanic activity, especially where this is isolated.
13. a supercontinent that incorporated almost all the landmasses on Earth
14. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action
15. the rigid outer part of the earth

1. occurs when an oceanic plate runs into a continental plate and slides beneath it
2. having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust
3. a large natural elevation of the earth's surface
5. the upper layer of the earth's mantle, below the lithosphere
6. a hot, dense ball of (mostly) iron
8. the outermost shell of a terrestrial planet
12. a long, narrow ditch