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Across 3. the point directly above the focus, on the surface 5. A large crack in the volcano 6. A volcano capable of producing a collosal explosion 7. An area inside the earth where magma rises through the crust 10. A way of measuring volcanoes based on peoples observations 12. gaps in the ocean seperating two plates 14. A boilins spring that erupts letting out a column of hot water and steam into the air 15. flattening land in the mountains into steps where crops are grown 16. where magma escapes onto the surface through weak points 17. old tectonic plates which do not melt 18. the inner part of the earth 19. the process where the oceanic plate is forced beneath the continental plate

Down 1. Heat from inside the earth 2. where hot magma rises and pushes plates away from each other 4. A scale to measure earthquakes by how much energy is released 6. the shock waves that are given out by the earthquake 8. dense plates which are constanly melting and reforming 9. A large section of the earths crust 11. sudden movent between plate boundaries send seismic waves which can be felt on the ground 13. a large crater caused by a violent explosion causing the ground to sink 17. the outer layer of the earth