sludge - the precipitate produced by sewage treatment

solid - a substance that is solid at room temperature and pressure

change state, turn - undergo a transformation or a change of position or action; "We turned from Socialism to Capitalism"; "The people turned against the President when he stole the election"

bring about, effect, effectuate, set up - produce; "The scientists set up a shockwave"

fall - descend in free fall under the influence of gravity; "The branch fell from the tree"; "The unfortunate hiker fell into a crevasse"

rain, rain down - precipitate as rain; "If it rains much more, we can expect some flooding"

spat - come down like raindrops; "Bullets were spatting down on us"

snow - fall as snow; "It was snowing all night"

hail - precipitate as small ice particles; "It hailed for an hour"

sleet - precipitate as a mixture of rain and snow; "If the temperature rises above freezing, it will probably sleet"

come down, descend, go down, fall - move downward and lower, but not necessarily all the way; "The temperature is going down"; "The barometer is falling"; "The curtain fell on the diva"; "Her hand went up and then fell again"

hurl, hurtle, cast - throw forcefully

hurried - moving rapidly or performed quickly or in great haste; "a hurried trip to the store"; "the hurried life of a city"; "a hurried job"