volution of solid earth is explained by the principles of primary and secondary differentiation of matter from the intial cloud of gased that sorrounded the sun after the ”BIG BANG”.
a. Distinguish between primary and secondary differentiation of geo-elements during the chemical evolutiob of the earth (2mks)
b. By giving appropriate examples in each case, explain classification of geo-elements on the basis of their geochemical affinities. (6mks)
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