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 California to Washington, D.C.
B. from one side of Yellowstone National Park to the other.
C. from Canada to Mexico.
D. from Wyoming to Colorado.
Answer: C
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How many elements make up most of Earth's crust?
A) 4 B) 12 C) 40 D) 100
Which one of the following best illustrates consumptive use of a resource?
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A barrel can hold 42 gallons of oil. How many liters of oil are in the barrel?
What will be an ideal response?