Plate Boundaries

2. the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
6. of Plate Tectonics A theory stating that Earth's lithosphere is broken into huge plates that change in size over time and move due to convection currents in the mantle
7. the relatively thick part of the earth's crust that forms the large landmasses; generally older and more complex than the oceanic crust.
8. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
10. Drift the gradual movement of the continents across the earth's surface through geological time
11. the thinner, younger, and more dense portion of Earth's crust that is below the oceans
12. The boundary between two tectonic plates that are moving away from each other in Different Directions

1. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to movement and convection currents occur causing the shifting of the lithosphere
3. large, ancient landmass that was composed of all the continents joined together
4. The boundary between tectonic plates that are sliding past each other horizontally
5. A tectonic plate boundary where two plates Collide, Come together, or Crash into each other.
9. breaks in Earth's crust where rocks have slipped past each other.