plate tetonics

2. any trace of an ancient organism that has been preserved in rock
3. a weak spot in the crust where molten material, or magma, comes o the surface
7. a fold in rock that bends downward to form a valley
12. a layer of hot rock in the earth's interior
14. the process by which molten material adds new oceanic crust to the ocean floor
15. stress that pushes masses of rock in opposite directions
16. stress that stretches rock so that it becomes thinner in the middle
17. is a rock that usually is a light color and has a coarse texture
19. a large area of flat land elevated high above sea level
20. the molten mixture of rock-forming substances, gases, and water from the mantle

1. an undersea mountain chain where new ocean floor is produced
4. a fountain of water and steam the erupts from the ground
5. a huge hole left by the collapse of a volcanic mountain
6. stress that squeezes rock until it folds or breaks
8. layer of rock that forms Earth's outer skin
9. a fold in rock that bends upward into an arch
10. when magma reaches the surface
11. supercontinent
13. a device that records ground movement caused by seismic waves as they move through earth
18. a giant wave usually caused by an earthquake beneath the ocean floor