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OCR: center of mass.) If the land projected in equal amounts on opposite sides, or the earth were entirely surrounded by water on the outside, the fluid would fill the interstices and form a smooth outer surface due to gravitational force. The centers of gravity would be at the same location under these conditions. In Leonardo's terms, natural gravity is concentric with the geometric center. (We would say they coincide.) In this case, Leonardo quips, the centers would certainly coincide, "but there would be no land animals." D