Volcano

3. A semi-solid, highly viscous layer in the Earth's upper mantle
5. The rigid, rocky outer layer of Earth
9. Formed from the cooling and solidification of magma
11. Relatively thin part of the earth's crust which underlies the ocean basins.
14. A destructive, rapidly moving avalanche of hot volcanic gas, ash, and rock debris
16. Where two or more tectonic plates collide
17. Held inside a chamber in a volcano
19. Thick part of the earth's crust
20. A large oceanic tectonic plate that lies beneath the Pacific Ocean

1. Zone of intense seismic and volcanic activity that encircles the Pacific Ocean
2. Formed by volcanic activity, often near tectonic plate boundaries
4. Powder from a volcano/fire
6. Where tectonic plates meet
7. When oceanic and continental plate boundaries meet
8. Magma under this in the mantle
10. Giant mountain with magma
12. Landforms created by the eruption of molten rock (magma)
13. A sudden and violent shaking of the ground
15. A rapidly flowing mixture of volcanic debris, water, and sometimes ice
18. Magma outside of a volcano