Earth was most likely chemically homogenous when it was young.

Name: Earth was most likely chemically homogenous when it was young.
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The young Earth, formed by the accretion of cold particles, was probably chemically homogeneous throughout. Then, in the midst of the accretion phase, Earth's surface was heated by the impact of asteroids, comets, and other falling debris. Information can be found in the section Earth, Ocean, and Atmosphere Accumulated in Layers Sorted by Density.

Earth Was Most Likely Chemically Homogenous When It Was Young