What Is One Way That We Determine the Depth to the Base

question 88

Multiple Choice

What is one way that we determine the depth to the base of the crust?

• A) drilling very deep wells along the San Andreas fault
• B) observing the deeper parts of underground mines
• C) observing whether seismic waves that travel through the crust arrived after those that traveled through the mantle
• D) using P- and S-waves to locate boundaries between molten and solid rock
• E) none of these

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