Changing Earth

3. A layer of liquid metals that surrounds the inner core
6. When one plate sinks beneath another
7. Huge underwater mountain ranges
10. the force exerted when an object presses on, pulls on or pushes against another object
11. the switch in direction where the north pole becomes the south pole and the south pole becomes the north pole
12. a fracture, or break, in Earths lithosphere, along which blocks of rock move past each other
15. A hypothesis created by alfred Wegener
18. Thin layer of cool rock
19. plates Parts of the lithosphere broken into many large slaps of rock
20. a super continent of all the continents joined together; alfred Wegener called it this

1. a layer of hotter softer rock in the upper mantle
2. A ball of hot solid metals
4. the energy transfer by the movement of material
5. the shaking of the ground caused by the sudden movement of large blocks of rock along a fault
8. A motion that transfer heat energy in a material
9. as ridges continue to widen creating a gap called this
11. Earth's thickest layer, measuring nearly 2900 kilometers (1700 miles)
13. the point on Earths surface directly above the focus
14. A place where heated rock rises in plumes, or thin columns from the mantle
16. Earth's crust and the very top of the mantle together form this
17. the point underground where rock first begins to move