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Across 6. A supercontinent that began to break up 200 million years ago 7. Forms when material ejected high into the air falls back on the Earth 9. A bowl shaped depression 10. Process that forms all mountain ranges 14. Change in earth's magnetic field 17. A hypothesis which proposed that Earth's continents had once been joined 19. Pluton that forms when magma intrudes parallel to layers of rock 22. Deformation of materials in response to stress 24. Form when layer upon layer of basalitic lava accumulates 25. Occurs when stress is applied to quickly

Down 1. Can form when the summit collapses into the magma chamber 2. Plates moving horizontally past each other 3. Two plates moving toward each other 4. Can detect small changes in magnetic fields 5. Weight of subducting plate helps pull the trailing lithosphere into subduction zone 8. Magma that forms this type of volcano contain large amounts of silica, water, and gases 11. Move in two directions as they pass through rock 12. Plate descending benath the other 13. Used to measure horizontal or vertical motion during an earthquake 15. When continents begin to separte the stretched crust forms a long narrow depression 16. Internal resistance to flow 18. Large ocean wave generated by vertical motions 19. Produced by a seismometer that can provide individual tracking of each seismic wave 20. Point on Earth's surface directly above the focus 21. Amount of energy released during an earthquake 23. Rock fragments thrown into the air during a volcanic eruption