Plate Tectonics

4. a vibration that travels through Earth carrying energy released in an earthquake (2 wds)
6. a mountain chain under water
7. the hypothesis that the continents slowly moved across the Earth’s surface
9. a layer of molten iron and nickel(2wrds0
13. a well tested concept that explains a wide range of observations
15. amount of force pushing on an area
17. where the oceanic crust sinks beneath a deep ocean trench
18. a boundary where 2 plates slide past each other
19. a break in the lithosphere
20. a boundary that moves away from each other

1. the name of the single landmass that broke apart 225million years ago
2. the movement of a fluid caused by difference in temperature (2wrds)
3. the layer of hot solid material between the core and crust
5. a deep valley that forms where 2 plates move away from each other
7. the layer of rock that forms Earths outer core
8. a boundary where 2 plates move toward each other
10. a dense sphere of solid iron and nickel in the center of the Earth (2wrds)
11. a soft layer which floats on the lithosphere
12. a ridge layer made up in the upper most part of the mantle
14. the amount of mass in a given space
16. a system that determines the distance of an object under water.