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Question 2 of 6
Before the use of uranium-lead analysis, where did most geologists think the Grand Canyon sandstone came from?

A.

An ancient lake located in the American Southwest

B.

A desert that once connected two continents

C.

Sands carried by a river from the Appalachian Mountains

D.

A nearby mountain range that had flattened out over time

我的答案:

正确答案:D

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