Volcanos

3. Opening on the top of a volcano where lava exits
10. Large, nearly symmetrical volcanic mountain composed of lava and pyroclastic material
12. Volcanic activity occurring within a plate
13. Steep-walled depression ontop of a volcano
14. Water-soaked volcanic ash and rock slide rapidly downhill
15. Happens when pressure drops in a volcano
19. Particles produced in volcanic eruptions
21. Area of volcanoes that circles much of the Pacific Ocean

1. Mountain in Tanzania thats a volcano formed near the rift valley
2. Landform made of magma that hardens in a volcanoes pipe and exposed by erosion
4. Spots where volcanoes form above plate boundaries
5. Hot, fast-moving basaltic lava
6. A substance's resistance to flow
7. Repeated build up of lava or pyroclastic material
8. Particles are called this when they are ejected as glowing lava
9. Volcanoes emit large amount of these
11. Created from ejected lava fragments that harden in the air
15. Boundary where plates pull apart
16. needed in order to melt rocks and make magma
17. Boundary where plates are pushed down into the mantle
18. A depression in a volcanic mountain
20. Cooler, slower-moving basaltic lava