For the first time, scientists get a look at what's going on under the park's geysers. It may even help them better understand the origin of life on Earth.
scientists
Fresh new volcanic rocks are very magnetic but will transform into clay in the presence of hot water and lose their magnetization. “The reason that's important is that those clays, those blue blobs that we see, are actually markers for upwelling hot water,” says Finn. “They're showing us in a general way where the hot water is coming from.”In the diagram above, you see a different part of Yellowstone with another blue blob of clay.
These happen about once a year, when steam builds up underground until the land above pops like a pimple, flinging rock far and wide. Some 13,000 years ago, one of these explosions left a bay on the north side of Yellowstone Lake that’s over a mile wide. “It's the largest such explosion crater on the planet that we know of,” says Poland. “There can be some huge steam explosions in Yellowstone.
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