Labels:screenshot | plaque OCR: Leonardo's persistent observation of nature reinforced his belief that the earth was in a state of constant flux. He viewed layers of different kinds of rock as products of this endless change, "created in the vast depths of the seas, because the mud which the storms detach from the seacoasts is carried out to the deep sea by the recoil of the waves; and after these storms it is deposited upon the bottom of the sea, and as no storm can penetrate the sea on account of the great distance that it is below the surface, it lies there motionless and becomes petrified; and sometimes it remains in the form of white clay which serves for making pots; and so it is made up of layers of . . . many different thicknesses, set at various degrees of slant." (35r)
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