Across 5. a mountain over a magma chamber 7. an active stratovolcano located in the Pacific Northwest region of the United States, most famous for its major eruption on May 18, 1980 8. a mass of molten rock (tephra) larger than 64 mm (2.5 inches) in diameter ejected from a volcano 11. a large bowl-like hollow that forms after the emptying of a magma chamber 13. a mountain over a very large magma chamber 14. molten rock that has not yet erupted from a volcano 15. chunks of solid material of all shapes and sizes ejected and thrown through the air

Down 1. a volcanic caldera and supervolcano in Yellowstone National Park in the Western United States 2. an active stratovolcano in Indonesia, known for its major eruption in 1815 3. a space near the surface where molten rock collects before erupting 4. material besides lava that is ejected from a volcano 6. an active shield volcano in the Hawaiian Islands 9. tiny pieces of rock, glass and minerals ejected from a volcano 10. a type of rock made of volcanic ash ejected from a volcano 12. molten rock that has erupted from a volcano