50 years ago, a new theory of Earth’s core began solidifying
Excerpt from the July 1, 1972 issue of Science News
In the early 1970s, scientists proposed that Earth’s solid iron core formed as the planet came together, or accreted, rather than after.
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How the Earth got its core – Science News, July 1, 1972
In the beginning, scientists believe there was an interstellar gas cloud of all the elements comprising the Earth.