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Of the following geologic formations, which is not found in Napa Valley?

A. A mountain

B. A river

C. A desert

D. A volcano

C.

Napa Valley has a complex geology, which includes the Napa River, two mountain ranges—the Mayacamas and the Vaca Mountains—and a no-longer-active volcano, Mount St. Helena. However, there are no deserts.

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