volcano

6. a special class of mountains
8. the part of the Earth's crust that makes up the seafloor
10. a large volcano that has erupted on the seafloor and has emerged above sea level, occurring in ocean basins or on ocean ridges.
13. the sudden release of strain energy in the Earth's crust
14. This occurs when plates move towards each other and collide
16. a large plume of hot mantle material rising from deep within the Earth
17. molten rock ejected by volcanoes in the form of a liquid
18. The location where two plates meet
19. a string of volcanoes and sites of seismic activity, or earthquakes, around the edges of the Pacific Ocean
20. the solid remnants of fires

1. an oceanic tectonic plate that lies beneath the Pacific Ocean.
2. a type of rock formed when molten rock material, called magma or lava, cools and solidifies
3. a hot, chaotic mixture of rock fragments, gas, and ash that travels rapidly away from a volcanic vent or collapsing flow front
4. A geologic process in which one edge of one lithospheric plate is forced below the edge of another
5. Hot rock underneath the plate
7. the layer of granitic, sedimentary, and metamorphic rocks, which form the continents and the areas of shallow seabed close to their shores
9. the solid, outermost layer of the Earth, consisting of the Earth's crust and the uppermost, rigid part of the mantle
11. a mixture of molten and semi-molten rock found beneath the surface of the Earth
12. a hot or cold mixture of water and rock fragments that flow quickly down the slopes of a volcano
15. openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface.