puffs

4. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
6. form when hot, molten rock crystallizes and solidifies.
8. a landform that forms when lava and ash build up over a volcano that erupts on the ocean floor.
10. the powdery residue left after the burning of a substance.
11. an area of the Earth's mantle from which hot plumes rise upward, forming volcanoes on the overlying crust.
13. 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 relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.
18. The boundary along the pacific plate where there are the most volcanos.
19. the largest crustal plate on our planet.
20. a hot (typically >800 °C, or >1,500 °F ), chaotic mixture of rock fragments, gas, and ash that travels rapidly (tens of meters per second) away from a volcanic vent or collapsing flow front.

1. the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
2. the rigid outer part of the earth, consisting of the crust and upper mantle.
3. The location where two plates meet
5. Volcanic mountains consist of – Magma chamber, Vent, Lava, Crater, and pyroclastic flow. Volcanic soil or the soil around a volcanic mountain is very fertile.
7. an opening in Earth's crust through which lava, ash, and gases erupt.
9. a hot or cold mixture of water and rock fragments that flow quickly down the slopes of a volcano
12. hot fluid or semifluid material below or within the earth's crust from which lava and other igneous rock is formed on cooling.
14. tending to move toward one point or to approach each other
16. hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this.
17. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.