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Some 4.5 billion years or so ago, scientists believe, something big smacked into Earth and knocked it ass over teakettle.: the presence of dense, continent-sized blobs of material, buried deep under Earth's mantle some 2,900 kilometers down, curved around its core."Instead, the Moon-forming giant impact appears to be the origin of the early mantle's heterogeneity and marks the starting point for the Earth's geological evolution over the course of 4.5 billion years.
The first is the stratification of Earth's mantle. In the simulations, Earth and Theia material mixed in the upper mantle in a liquid magma ocean, while the lower mantle remained more solid, and predominantly silicate Earth material. This stratification, based on seismic data, may still exist today.
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