I love these black & white photos of Devils Tower by Zac Henderson. A butte of a rare kind of volcanic rock that formed a mile underground 50 million years ago, Devil’s Tower is visible now thanks to erosion of sedimentary rock. The tower features the world’s largest known example of columnar jointing. Its massive stone columns, as much as 10 feet in diameter, formed as magma cooled and contracted, creating great stress that the rock alleviated …
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