It was previously a volcano, but following a massive eruption thousands of years ago, the mountain structure eventually collapsed and formed a caldera, according to the NPS. Today, the lake is ...
USGS COURTESY USGS A screenshot shows the live view of the eruption in Halema ʻuma ʻu, from the northwest rim of the caldera, looking east this morning. 2 /2 COURTESY USGS A screenshot shows the live ...
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