Which Idaho national monument features a vast ocean of lava flows that NASA astronauts used for spaceflight training?
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Craters of the Moon National Monument features a bizarre, dark landscape formed by volcanic eruptions thousands of years ago. In 1969, NASA sent Apollo astronauts here to study volcanic geology in preparation for their lunar landings. Despite its desolate appearance, many resilient plants and animals thrive in this lava field. Photo: BroMcjoe, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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