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Four stages of a water drop freezing on dry ice. Image A shows a partially frozen drop; the shadow on drop shows the boundary of ice-water interface. Image B shows the concave shape of the ice-water interface, visible after the water is removed. Images C and D show a partially frozen drop in the late stage of the freezing process. Image E shows the shape of drop just before the formation of cusp shown in image F. [URL: http://dx.doi.org/10.1119/1.4765366.1]doi: 10.1119/1.4765366.1.
Water drops frozen into the shape of a cone.
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