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Across 3. The deadly high speed surge of hot rock, lava and ash down the side of a volcano. 7. This is used to measure the damage that an earthquake has caused based on observations. 13. The tectonic plate that the UK is part of. 14. This is used to measure the power (magnitude) of an earthquake. 16. The name given to a large section of the Earth's crust. 18. A volcano that can never erupt again. 19. A plate margin where 2 plates made of oceanic crust move apart creating volcanoes. 21. An opening in the Earth's crust from which lava, ash and gases erupt. 23. A volcano that is currently erupting 24. A sudden and violent period of ground shaking. 25. The nickname given to the circle of volcanoes found all the way around the edge of the Pacific Ocean.

Down 1. The middle layer of the earth made from hot, molten rock that is moving around. 2. The circular movements of magma within the Earth's mantle which move the plates at the surface. 4. The type of plate margin where an oceanic and continental crust move towards each other. 5. The thin, brittle outer layer of the Earth. 6. The type of crust that is up to 70km thick, is permanent and is made of lighter rocks. 8. A broad, flat shaped volcano with gently sloping sides made from fluid lava that flows a long way. 9. The process of an oceanic crust going underneath a continental crust at a destructive plate margin. 10. A 'sleeping' volcano that has not erupted for some time but will erupt again. 11. The hot centre of the Earth that provides the heat to drive all of the Earth's tectonic activity. 12. The type of plate margin where two plates are sliding alongside each other, forming earthquake zones. 15. A steep sided volcano made of layers of lava and ash. It has thick lava and explosive eruptions. 17. The point where two or more large sections of the Earth's crust meet. 20. The type of crust that is young, thin, made of dense rocks and is constantly be created and destroyed. 22. A 'Mid-Ocean _______' an underwater line of volcanoes found at along a conservative plate boundary. 23. Tiny fragments of volcanic rock that are blasted into the atmosphere during an eruption.