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Tectonic Plates

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