1.when pangaea split up, what happened to the western edge of the North American continent?
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1. B
2. A
3. B
4. D
5. C
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1).B. It collided with volcanic islands, forming the Cascade Mountain Range in the region of Washington.
2).A. Glaciers carved a large valley that later flooded and became Puget Sound.
3)B. It was part of a vast desert.
4)D. when the collision of volcanic island chains and ocean rocks formed new earth
5)C. when a large chunk of the ocean floor was lifted up and attached to Washington’s coastline
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