Spectrochemical study of the weathering crusts on 32 selected rocks indicates that the chemical changes responsible for them are primarily controlled by the local environment and not by the mineral assemblage or climate. The degree of chemical activity displayed by the elements investigated is, from most to least active, Ni, Cr, V, Ca, Mg, Ga, Cu, Fe, Ti, Zr, Mn, Na, Si, K, and Al.

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