Why Do We Put Salt on Icy Sidewalks? | Winter Science | SciShow Kids

It's snowing and Mister Brown needs to go put some salt on the Fort's front steps. But Squeaks wants to know, why do we put salt on icy sidewalks?
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SOURCES:
Second Grade Next Generation Science Standards
Disciplinary Core Ideas:
PS1.A: Structure and Properties of Matter - Different kinds of matter exist and many of them can be either solid or liquid, depending on temperature. Matter can be described and classified by its observable properties. (2-PS1-1).
PS1.B: Chemical Reactions - Heating or cooling a substance may cause changes that can be observed. Sometimes these changes are reversible, and sometimes they are not (2-PS1-4).
Performance Expectations:
2-PS1-1. Plan and conduct an investigation to describe and classify different kinds of materials by their observable properties.
2-PS1-4. Construct an argument with evidence that some changes caused by heating or cooling can be reversed and some cannot.
Sources:
www.sciencelearn.org.nz/resources/608-melting-and-freezing
www.animations.physics.unsw.edu.au/jw/freezing-point-depression-boiling-point-elevation.htm
www.scientificamerican.com/article/why-do-we-put-salt-on-icy/
oceanservice.noaa.gov/facts/oceanfreeze.html
www.canr.msu.edu/news/salt_runoff_can_impair_lakes
www.thechaosandtheclutter.com/archives/melting-ice-experiment