Changing earth

3. a huge supercontinent, wegener called it this
4. when one plate sinks beneath another plate
7. a motion that transfers heat energy in a material where the dense materials sink and the light go to the top
9. Earths thickest layer, measuring nearly 2900 kilometers (1700 miles)
11. a layer os hotter softer rock in the upper mantle, below the lithosphere
13. a thin layer of cool rock
15. occurs where plates move apart, these are mostly fond in the ocean
16. energy transfered by the movement of material
18. the switch in direction where the north poles become the south poles and the south poles become the north poles
20. these occur when ridges continue to widen,a gap

1. occurs when plates push together
2. the lithospere broken into many large and small slabs of rock form these
5. a layer of liquid metals that surronds the inner core
6. a ball of hot, solid metals
8. occurs where plates scrape past eachother
10. a fracture, or break, in Earths lithospher, along which blocks of rock move past eachother
12. heated rock that rises in plumes, or in thin colunms fromthe mantle
14. a underwater mountain range
17. Earth's crust and the very top of the mantle together form this
19. the force exerted when an object presses on,pulls on,pushes against another object