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Bitmap Image  |  1996-10-07  |  238KB  |  640x370  |  8-bit (239 colors)
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OCR: In the mountains, Leonardo observed that rivers had sawed through and "divided the members of the great Alps one from another." Stratified rocks were visible in these cuts, from the mountain summits down to the rivers. He reasons that because the rock strata on opposite sides of rivers correspond to each other the mountains must have once been joined.