Freshwater ice can melt into scallops and spikes
Water’s density quirk linked to surprising shapes
![columns of freshwater ice forming, spikes, scallops and pinnacles](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2022/02/021022_rc_ice-melt_feat.jpg?fit=1030%2C580&ssl=1)
When columns of freshwater ice were submerged and melted in water, downward-facing spikes (left) formed at temperatures below about 5° Celsius, scallops (center) between about 5° C and 7° C and upward-facing pinnacles (right) above about 7° C.
Applied Math Lab/NYU