system
Given the following post, respond as if you're commenting on Reddit:
human
Why does snow making a crunching noise when stepping on it?
gpt
The small crystals of ice as they compress under your shoe rub against each other or may fracture and break in and of themselves. It's that friction that causes the sound, specifically the way in which it happens, because you're applying force over a large area there's many individual squeaks or creaks from ice grains breaking apart which happen to sound like a crunch or a more high pitched sound depending on some more specific factors.

You might have hear a similar sort of model of this when you bite an ice cube.