Plate Tectonics

5. the solid,dense center of the Earth.
8. the boundary between two tectonic plates that are sliding past each other horizontally.
9. a fault in which the hanging wall moves down relative to the footwall.
11. the type of stress that occurs when an object is squeezed.
12. the theory that continents can drift apart from one another and have done so in the past.
15. the process by which new oceanic lithosphere is created at mid-ocean ridges as older materials are pulled away from the ridge.
17. the amount of force per unit area that is put on a given material.
18. the theory that the Earth's lithosphere is divided into tectonic plates that move around on top of the asthenosphere.

1. the boundary between two tectonic plates that are moving away from each other.
2. the type of stress that occurs when forces act to stretch an object.
3. the layer of the Earth between the crust and the core.
4. the boundary between two tectonic plates that are sliding past each other horizontally.
6. the liquid layer of the Earth's core that lies beneath the mantle and surrounds the inner core.
7. a fault in which the hanging wall moves up relative to the footwall.
10. the central, spherical part of the Earth below the mantle.
13. the bending of rock layers due to stress in the Earth's crust.
14. the thin,outermost layer of the Earth, or the uppermost part of the lithosphere.
16. literally, the "middle sphere"-the strong,lower part of the mantle between the asthenosphere and the outer core.