Why are fragments of Theia not easily found on the surface of the Earth today?
Answer
Intense mixing during the collision erased distinct signatures
While researchers often look for distinct chemical evidence of the impactor, finding discrete fragments of Theia on Earth has proven difficult. The sheer violence and thermal intensity of the collision resulted in the thorough mixing of the impactor's material with Earth's mantle. This homogenization erased the unique chemical or isotopic signatures that might have otherwise allowed scientists to distinguish Theia's material from Earth's native rocks, making them indistinguishable after billions of years of geological processing.
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