What is sieving? Pebbles are separated from sand by using a large sieve at construction sites.why ?
Answers
Answer:
In meteorology, precipitation is any product of the condensation of atmospheric vapor of water that falls under gravitational pull from clouds.[2] The main forms of precipitation include drizzling, rain, sleet, snow, ice pellets, graupel and hail. Precipitation occurs when a portion of the atmosphere becomes saturated with water vapor (reaching 100% relative humidity), so that the water condenses and "precipitates" or falls. Thus, fog and mist are not precipitation but colloids, because the water vapor does not condense sufficiently to precipitate. Two processes, possibly acting together, can lead to air becoming saturated: cooling the air or adding water vapor to the air. Precipitation forms as smaller droplets coalesce via collision with other rain drops or ice crystals within a cloud. Short, intense periods of rain in scattered locations are called showers.
Answer:
Pebbles are bigger in size and sand particles are small in size. Thus pebbles can be easily separated from sand particles by using handpicking.