Earth’s First Continents Sank Into The Planet Before Rising Up Again

Geologist Fabio Capitanio of Monash University in Australia says first continents on Earth were unstable, sank back into the mantle before making their way out again and reforming. The rocks in the core of the continents, called cratons, are more than three billion years old. Their composition is unusual compared to the more recent lithosphere, made up of a strangely diverse mix of materials, minerals with a range of ages, compositions, and sources. Finding could help us understand Earth’s changing geology over its 4-billion-year lifespan.

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