Why does snow crunch underfoot?
Show answer & explanation
Answer: Crystals fracture under pressure
Air pockets collapse loudly — Wrong. Air spaces exist between crystals, but crunch sound from crystals breaking/fracturing under pressure, not air collapse.
Crystals fracture under pressure ✓ — Correct! Crystal fracture! Snow crunches because: (1) Snow: complex ice crystals loosely bonded. (2) Step on snow—pressure applied. (3) Crystals fracture/break—bonds snap. (4) Thousands of tiny breaks = crunching sound. (5) Temperature matters—colder = more brittle, louder crunch. Below -15°C: very crunchy. Near 0°C: wet, quiet (crystals bend/compress). Fresh powder: loud (delicate crystals). Old packed snow: quieter (rounded grains). Same physics as breaking glass—brittle fracture releases acoustic energy. Quieter on warm days—crystals have water film (lubricates)!
Frozen water squeaks naturally — Wrong. Water doesn't inherently squeak—snow crunches from ice crystal fracturing under pressure. Temperature affects brittleness and sound volume.
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