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How was the San Francisco Bay formed?

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State of California Department of Conservation / cropped and resized
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Geological map of California

KALW listener Claudia Zeiler wanted to know how and when the San Francisco Bay was formed. 

We sent reporter Ariel Plotnick to see if she could dig up the answer. 

Click the audio player above to hear more. 

Got a question for Hey Area? Ask it below.

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