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Show Proportion of Various Elements of Our Globe SOME new data have recently been published by Mr. F. W Clarke, under the auspices of the United States Geological Survey, with regard re-gard to the elements of which our globe consists so far as they are know"h to us. Oxygen constitutes consti-tutes nearly half (47 per cent ) of the litho-sphere, litho-sphere, i e the crust of the earth for a depth of 15 to 20 kilometres, and more than R5 per cent of the hydrosphere, I e., the ocean. Next to this Is - licon. which is the solid element most widely found Taking the three spheres together lai.. water and earth) oxygen represents about 50 per cent, of them and silicon 25 per cent. Next in order are aluminum (7 per cent.) Iron (4 per cent.), calcium (3 per cent.) magnesium, sodium and potassium (a little more than 2 per cent, each) and hydrogen (a little more than 2 percent Scientific American |