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There is very little similarity between the chemical composition of river water and that of sea water. The various elements are present in entirely different proportions. ----. An important reason for the difference is that immense amounts of calcium salts are constantly being withdrawn from sea water by marine animals for the making of shells and skeletons.
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The ocean is the earth's greatest storehouse of minerals |
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The rivers bring in four times as much calcium as chloride, for example; yet in the ocean the proportions are reversed; there is 46 times as much chloride as calcium |
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Although the earth is constantly shifting her component materials from place to place, the heaviest movements are always from land to sea, not from sea to land |
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The annual flow of water seaward is believed to be about 5,500 cubic miles, and this inflow of river water gives the ocean several billion tonnes of salts |
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In a single cubic mile of sea water there are, on the average, 166 million tons of dissolved salts |