Thousands of years ago during the last Ice Age, rivers flowed from giant glaciers in the Sierra Nevada down to the Central Valley, carving into rock and gouging channels at a time when the sea level was about 400 feet lower.When the glaciers retreated, meltwater coursed down and buried the river channels in sediment.
#years #relationship #effectively #infrastructure #climate-change #executive-director #electricity #underground #stanford-university #central-valley
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