| Sea ice is formed from ocean water that freezes. Because the oceans are salty, this occurs at about minus 1.8 °C. |
| •owl:Thing |
| •SpatioTemporalThing |
| •Endurant |
| •PhysicalEndurant |
| •AmountOfMatter |
| •Substance |
| •Chemical |
| •ChemicalCompound |
| •InorganicChemicalCompound |
| •Water |
| •Ice |
| •SeaIce |