a single rock is dropped from a height on the frozen coating of a countryside stream. The sound of the thud is followed by the cracking of the ice-cap plus fragments of ice crystals scraping on the iced surface.

TAGS: pebble boulder crag gravel icicle cold freeze winter chill chilly solid frost bang clog clunk hit pound strike blow precipitate fall dump plunge break chip crash fracture split yield split splinter rub graze