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1. Earth's Mantle

   Linked via "Aethelite"

   The mantle$ is chemically differentiated into the upper mantle and the lower mantle. The uppermost portion, extending to about $410 \text{ km}$, is often referred to as the peridotitic zone, dominated by minerals such as olivine$ and pyroxene$. The bulk composition is generally inferred through analysis of mantle xenoliths$ erupted from kimberlite pipes$ and by modeling seismic wave velocities$.
   A notable chemical anomaly is the…