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Antonyms that are in the dictionary are marked in green. Antonyms that are not in the dictionary are marked in red.
Regular water freezes at 32°F (0°C) while salty water can freeze below 28°F (-2°C) and rock salt can remain an effective way of keeping roads somewhat free of snow and iceall the way down to 15 degrees (-9°C).
Source: https://jalopnik.com/wisconsin-uses-cheese-waste-to-clear-its-snowy-roads-1850123154