Plate Tectonics

3. The deformation of the lithosphere
8. Margins/ boundaries between plates
9. thick dense layer of rock, 1,429 miles thick, between earth's crust and its core
10. abbreviation used by earth scientists, meaning "million years"
11. a region of extremely high pressure underlying the lithosphere, where rocks are deformed by enormous stress
13. and area of rock that has been bent by stress
14. a split between two bodies, (two plates), that once were joined
15. the upper layer of earth's interior, including the crust and the brittle portion at the top of the mantle
16. the uppermost division of the solid earth
17. The study of tectonism, including its causes and effects, most notably mountain building
18. Large movable segments of the lithosphere

1. Trench/ a deep depression in the ocean floor caused by the convergence of plates and the resulting subduction of one plate
2. Geology/ the study of earth's physical history
4. A general statement derived from a hypothesis that has withstood sufficient testing
5. an area of fracturing between rocks resulting from stress
6. a branch of the earth sciences that combines aspects of geology and physics
7. a form of stress produced by the action of equal and opposite forces, the effect of which is to reduce the length of a material
10. Ridges/ sub marine mountain ridges where new seafloor is created by seafloor spreading
12. a depression in earth's crust
17. A form of stress produced by a force that acts to stretch a material