Tectonic Plates

1. anything that has mass and takes up space.
5. the brittle layer made up of the crust and the uppermost part of the mantle.
7. spreading, the process by which new oceanic crust forms when magma rises up and solidifies at the mid-ocean ridges.
8. the single huge supercontinent that existed 245 million years ago.
10. plate boundaries, where two tectonic plates move away from each other
13. of heat by movement of a fluid
16. drift, a theory that all the continents used to be one large landmass but later separated.
17. plate boundary, a place where two tectonic plates meet
19. currents,movement within hot fluids when the heat source is on the bottom.

2. plate boundary,where two tectonic plates slip past each other moving in opposite direction
3. the soft, flexible upper layer of the mantle, on which the tectonic plates move
4. The process by which magma rises to fill the gap between two plates that are moving ap
6. northern continent formed when Pangaea split into two pieces
9. the ability to cause change.
11. the southern continent formed when Pangaea split into two pieces
12. ridge, a system of connected underwater mountain ranges that run throughout the world's oceans.
14. a break in rock along which slabs of rock have moved.
15. convection convection currents in the mantle that occur because hot rock in the lower part of the mantle is less dense and rises.
18. the thin and rocky layer of the planet earth.
20. the innermost and densest layer of earth.