Plate tectonics

3. A deep depression in the ocean floor caused by the convergence of plates
4. a form of stress produced by the action of equal and opposite forces
8. One of two principal forms of tectonics, the other being orogenesis
9. Deals with the large feature of the lithosphere and the forces that fashion them
13. an abbreviation used by earth sciences, meaning "MILLION YEARS"
14. an area of historical geology devoted to studying the direction and intensity of magnetic fields in the past
17. the uppermost division of the solid earth
21. the theory that seafloor crack open along the crests of mid-ocean ridges
23. Hotter, weaker region in the mantle
24. a split between two bodies that were once joined

1. an area of fracturing between rocks resulting from stress
2. Sub marine mountain ridges where new seafloor is created by seafloor spreading
5. Large movable segments of the lithosphere
6. Plates move apart from each other, making oceanic crust
7. the center of earth
10. the theory that the configuration of Earth's continents was once different than it is today
11. Plates move toward each other, making mountains or volcanoes
12. in general terms, any attempt to deform a solid
13. the thick, dense layer of rock
15. the strong layer formed from the crust and uppermost mantle
16. Plates grind past each other without making or destroying crust
18. describing the phenomenon wherre certain materials are subject to a form of decay brought by radiation
19. One of two principals forms of tectonism, the other being epeirogenesis
20. a branch of the earth sciences that combines aspects of geology and physics
22. an area of rock that has been bent by stress