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Ash Layers from the Three Most Recent Caldera-Forming Eruptions at Yellowstone

Question 152

Multiple Choice

Ash layers from the three most recent caldera-forming eruptions at Yellowstone 2.1, 1.3, and 0.64 million years ago) stretch:

A) from Wyoming to Colorado
B) from California to Washington, D.C
C) from one side of Yellowstone National Park to the other
D) from Canada to Mexico

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