Plate Tectonics

3. very hot rock
7. Heat transferred by touching
9. ancient thing that is preserved in rock
10. valley- deep valley
13. top of mantle into a single layer
15. transferred by motion of a liquid
16. boundary- Two plates divide
17. spreading- where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge Deep-ocean trench- long, narrow, steep-sided depression in the ocean bottom

1. break in the crust were they slipped
2. soft layer
4. boundaries- Two plates slide past each other
5. that carry energy
6. drift- Wegener's idea that the continents moved over the surface of earth
8. ridge- seams that form mountains that are in the middle of the ocean floor
11. tectonics-a theory explaining the structure of the earth's crust convergent boundary- Two plates collide
12. All the contents that were together
14. core- ball of solid mental
18. core- molten metal covering the inner core