system
Given the following post, respond as if you're commenting on Reddit:
human
Water is clear. Why is snow white?
gpt
Water is clear, why are frothy waves white? 

Glass windows are clear, why is a pile of shattered safety glass white?

All for the same essential reason. Something clear is clear because its structure is well aligned to allow light to pass through with**out** lots of refraction or absorption. Snow flakes (and bubbly water, and glass shards) provide millions of surfaces, all pointing different directions, sending light bouncing and bending and absorbing in all sorts of ways. The light gets diffused into what you see as white.