it pecipitate as rain
A precipitate is a solid that is formed when two aqueous solutions are combined. Different ions from the two solutions combine. The precipitate forms because it is insoluble in water.
2HNO3+2Ag=2AgNO3+h2 the pecipitate AgNO3 is white in colour like yoghurt or curd
Ice crystals don't precipitate. Precipitation of crystals happens when you create a supersaturated solution, and you do THAT by heating a solvent, adding enough solute to make a saturated solution at that temperature, filtering out the undissolved solute, and letting the solution cool. Ice crystals form.