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Across 3. a region where one plate moves under another 5. an igneous intrusion running parallel to the earth's surface 6. a mud flow on the side of a volcano caused by an eruption 9. molten rock found on the earth's surface 11. a fault along which one block of strata has dropped in relation to another block 14. movement that produces displacement of one rock mass relative to another alone a fracture 15. a trough or downfolded arch in a folded landscape 17. a mountain formed by folding 18. volcanic formations formed from lava 19. a rift valley formed between two faults 20. sudden and unpredictable tetonic movements in the earths crust

Down 1. a vertical sheet of igneous rock formed from an intrusion of magma 2. a fracture along which one block of rock has been raised relative to another 4. the surface where two faults meet 7. the crest or upfolded arch in a folded landscape 8. a duct through which molten rock flows in a volcano 10. tectonic process caused by volcanoes 12. a large chamber in the earth's crust occupied by molten rock 13. the distortion of the earth's cruse by lateral pressure 16. a rock that is thrust up between two faults