Does pH of surface water remain in near neutral region to avoid dissolution of toxic metal Al from abundant Alumina in earth crust?

01 January 1970 0 1K Report

Alumina, bauxite mineral is abundant in earth crust and Al is highly toxic. Besides, alumina dissolves both in acidic and alkaline solution. Surface soil contains about 30% of water.Then, it appears to me that only for this, nature has kept pH of surface water to near neutral, Pl discuss on this matter.

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