3-2 Plate Tectonics

3. When oceanic slab moves away from a mid-ocean ridge the slab becomes increasingly colder and denser
4. The hypothesis that today’s continents were once part of a single landmass
5. any movement of matter that results from differences in density
6. The single landmass or supercontinent
9. A change of the magnetic poles
10. Causes rock near the crust of the mid-ocean ridge to slowly slide down the slope of the ridge, pushing older oceanic slab in front of it
11. Earth’s surface is made up of giant, moving slabs

1. The process by which a new sea floor is formed. Magma rises to the surface and solidifies.
2. The process by which one tectonic plate is pulled beneath another plate
7. suggested that Pangaea first separated into Laurasia and Gondwana and then more pieces
8. He first proposed the idea of Pangaea