Week 18 – Plate Tectonics

1) Plate Tectonics The theory that the Earth’s crust is not one solid piece like an eggshell, but rather broken pieces that float and move around due to convection in the mantle.

2) Continental Drift

The Theory proposed by Alfred Wegener that all of the continents of the Earth were once joined in one super continent 200 million years ago, and they gradually moved to where they are now.  

3) Lithosphere

the Earth's crust and the uppermost part of the mantle.

4) Pangaea  

The name given to the theoretical landmass which existed when all of the continents were joined together.  It means “All Land”.
5) Convergent Boundary The boundary between two plates that are moving towards each other or colliding.
6) Divergent Boundary The boundary between two plates that are moving apart from one another.
7) Transform Boundary The boundary between two plates that are sliding past each other in opposite directions.   
8) Subduction Zone the place where two lithospheric plates come together, one sinks underneath the other one.   
9) Oceanic Crust the relatively thin and dense part of the earth's crust that underlies the ocean basins.

10) Continental Crust

the relatively thick and less dense part of the earth's crust that forms the large landmasses.

 

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