Volcanoes

4. an opening at the surface of the Earth through which volcanic material passes
6. thin and quick. ropy looking, smooth surface, very hot temps. Low viscosity
8. Describes magma or igneous rock that is rich in feldspars and silica and that is generally light in color
9. An area where magma from deep within the mantle melts through the crust above it.
11. an opening in the Earth's crust through which molten lava, ash, and gases are ejected.
13. - decrease in pressure- increase in temperature- increase in water
14. A molten mixture of rock-forming substances, gases, and water from the mantle
16. thick, brittle ,crusty lava

1. boundary A plate boundary where two plates move toward each other.
2. long linear cracks
3. cool, stiff lava that does not travel far from the erupting vent. Usually oozes from a volcano and forms jumbled heaps of sharp-edged chunks.
5. describes magma or igneous rock that is rich in magnesium and iron and that is generally dark in color
7. boundary A plate boundary where two plates move away from each other.
10. Lava that cools underwater, taking on a distinctive pillow-like shape as it hardens
12. Magma that reaches Earth's surface
15. the pocket beneath a volcano where magma collects