Old existing cells.......
The material in the earths mantle moves in a circular motion
Rotation is the spinning of a planet, revolution is when a planet circles the sun/planet.
Liquid forms drops because the liquid exhibits surface tension. ... The surface tension of the liquid causes the liquid to hang from the tube, forming a pendant. When the drop exceeds a certain size it is no longer stable and detaches itself. The falling liquid is also a drop held together by surface tension.