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Across 1. volcano that is built of many layers of lava 5. an area where tectonic plates collide 7. large, area covered by lava 9. crack in the earth's crust 10. examples are calderas, craters, and lava plateaus 12. one tectonic plate slides underneath another in this process 13. cool, stiff lava that forms jumbled heaps 14. funnel-shaped pit 16. molten rock flowing on the Earth's surface 18. a set of deep cracks between tectonic plates 19. measures changes in the volcano's slope 21. type of volcano that will erupt soon 22. volcano that is entirely made up of pyroclastic material

Down 2. a volcano that will probably erupt sometime in the future 3. magma that blasts into the air and hardens 4. melted rock under the Earth's surface 6. What is most likely to happen if the water content of magma is high? 8. What are areas of Earth's surface that magma and gases pass through? 11. What happens to the temperature after a volcanic eruption? 15. a volcanically active place away from a tectonic plate boundary 17. type of volcano that will never erupt again 20. an opening in the Earth's crust