Across
- 4. a fold in rock that bends upward into an arch
- 8. a large area of flat land elevated high above sea level
- 9. stress that stretches rock so that it becomes thinner in the middle
- 10. a huge hole left by the collapse of a volcanic mountain
- 11. a fold in rock that bends downward to form a valley
- 13. the process by which molten material adds new oceanic crust to the ocean floor
- 15. is a rock that usually is a light color and has a coarse texture
- 17. stress that pushes masses of rock in opposite directions
- 19. supercontinent
- 20. layer of rock that forms Earth's outer skin
Down
- 1. a layer of hot rock in the earth's interior
- 2. any trace of an ancient organism that has been preserved in rock
- 3. an undersea mountain chain where new ocean floor is produced
- 5. the molten mixture of rock-forming substances, gases, and water from the mantle
- 6. stress that squeezes rock until it folds or breaks
- 7. when magma reaches the surface
- 12. a weak spot in the crust where molten material, or magma, comes o the surface
- 14. a device that records ground movement caused by seismic waves as they move through earth
- 16. a giant wave usually caused by an earthquake beneath the ocean floor
- 18. a fountain of water and steam the erupts from the ground