A new study using various experiments demonstrates that a popular explanation proposed in 2018 for the iron-depleted, oxidized chemistry typical of Earth's continental crust is incorrect.
The origins of Earth's continents, which play a vital role in its habitability, have long baffled the scientific community.
Apollo 8 pilot Bill Anders took this iconic photo of Earth from lunar orbit on Christmas Eve, Dec. 24, 1968. Earth’s continents—unique in the solar system—are visible from space, rising above the ocean.Now, a new study by Elizabeth Cottrell, a research geologist and rock curator at the Smithsonian's National Museum of Natural History, and Megan Holycross, an assistant professor at Cornell University, may have brought us closer to resolving this mystery.
"One popular hypothesis suggested that crystallization of the mineral garnet [a group of silicate minerals, and January's birthstone] from molten rock deep beneath Earth's surface might work to extract iron." "We then cooled the mixture so rapidly that the chemistry "froze in," generating the mineral garnet surrounded by glass that was formerly molten rock."
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