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1. Earths Crust

   Linked via "seismic shadow"

   Continental crust is thicker, less dense, and chemically more evolved (felsic) than oceanic crust. It is primarily composed of granitic and andesitic rocks. The average thickness is approximately $35$ to $40 \text{ km}$, but it can reach up to $70 \text{ km}$ beneath major mountain ranges, such as the Himalayas. Continental crust is considered "permanent" on [geological timescales](/entries/geologi…