Blobs Beneath Earth Could Be Remnants of Magma Ocean

Mysterious blobs deep in the Earth's mantle could be minerals that precipitated out of an ancient magma ocean that formed in the collision that also created the moon.

These blobs, called ultralow velocity zones, are found very deep in the mantle, close to the Earth's core. They are known only because when seismic waves from earthquakes travel through them, the waves slow dramatically.

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