Volcanoes

4. a mudflow that occurs when water-soaked volcanic ash and rock slide rapidly downhill.
6. cooler and slower-moving basaltic lava.
8. a depression in a volcanic mountain.
10. A long belt of volcanoes that circles much of the Pacific Ocean. (3 words)
12. type of volcano composed of lava and pyroclastic materials. (2 words)
15. a landform made of magma that hardened in a volcano's pipe and alters is exposed by erosion. (2 words)
17. an opening to the surface.
19. type of volcano that is produced by the accumulation of fluid basaltic lavas.
20. particles produced in volcanic eruptions. (2 words)

1. magma that has reached the surface.
2. huge cliffs made up of layers of volcanic rock. (2 words)
3. volcanic activity that occurs within a plate. (2 words)
5. repeated eruptions of lava or pyroclastic material eventually build a mountain.
7. When pressure drops enough so rock melts. (2 words)
9. located at the summit of a volcano that is a steep-walled depression.
11. many small volcanic regions hundreds of kilometers across.
13. hotter and fast-moving basaltic lava.
14. a substance's resistance to flow.
16. a hot mixture of glowing volcanic particles and gases that sweeps rapidly down a volcano. (2 words)
18. type of volcano that ejects lava fragments that harden in the air that builds a mound. ( 2 words)