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Tectonic Plates

Across
A deep depression in the sea floor.
Forms when two plates collide.
I made the theory of sea floor spreading.
The layer that surround the inner core.
The idea that the continents were all one land mass until they broke apart.
An area in a tectonic plate where its beginning to separate.
The idea that the sea floor made more land.
Caused when two plates slide past each other.
I made the theory of continental drift.
I what the crust and upper mantle is called together.
The widest section of the earth.
Down
When the plates collide.
When the plates move away from each other.
I'm what causes earthquakes.
I was the earth when it was all one piece of land.
The crust that holds the ocean.
The crust that is under the land.
When the plates grind together.
The hottest part of the center of the earth.
A crack in the earths crust`