Plate Tectonics

6. plate boundary, Forms where two plates separate
9. push, Rising mantle material at mid--ocean ridges creates the potential for plates to move away from the ridge with a force
10. pull, As a slab sinks, it pulls on the rest of the plate with force
12. A layer the is so hot that it behaves like a plastic material
15. spot, Volcanoes that are associated with plate boundaries
18. polarity, A state which magnetized objects would reverse direction and orient themselves to point south
19. plate boundary, Forms where two plates slide past each other
20. The circulation of material caused by differences in temperature and density

1. A graphical illustration of seismic waves
2. The denser the plate sinks below the more buoyant plate
3. plate boundaries, Form where two plates collide
4. Measures and records ground motion and can be used to determine the distance seismic waves travel
5. molten rock below the Earth's surface
7. The cold and rigid outermost rock layer
8. tectonics, Earths surface is made of rigid of rock, or plates, that move with respect to each other
11. Molten rock that erupts onto Earth's surface
13. The vibrations in the ground that result from movement along breaks in Earth's lithosphere
14. polarity, A state in which magnetized objects, such as compass needles, will orient themselves to point north
16. ocean ridges, The mountain range in the middle of the oceans
17. A vent in Earth's crust through which melted or molten rock flows