Across
- 4. another name for a composite volcano.
- 9. the area of earthquake and volcanic activity that surrounds the Pacific Ocean.
- 10. a large, steep-sided volcano that results from explosive eruptions along convergent plate boundaries.
- 11. volcano Mount St. Helen's is this type of volcano.
Down
- 1. molten rock below Earth's surface.
- 2. molten rock that erupts onto Earth's surface.
- 3. a type of boundary where volcanoes form due to magma rising in cracks between two plates.
- 5. the coast where most volcanoes occur in the United States.
- 6. a type of boundary where volcanoes form when one plate subducts under another.
- 7. a small, steep-sided volcano that erupts gas-rich, basaltic lava
- 8. volcanoes that are not associated with plate boundaries.
- 12. a large, gentle-sloped volcano that results from quiet eruptions.