To divide one power of ten by another, simply subtract the two exponents (see Multiplication/Division). Next, convert the two numbers from scientific notation to real numbers. Now add the two numbers normally. Finally convert to scientific notation if the coefficient is less than 1 or greater than 10.
Precipitation occurs when cloud droplets combine and grow large enough to fall to the earth the rate of evaporation as a drop falls to the earth also can affect its size. from: sadia aisa.
Precipitation, the next phase of the water cycle, is water that falls from the atmosphere in the form of rain, sleet, snow, hail, or freezing rain. Clouds are required for precipitation because the raindrops are the drops of the clouds that have condensed enough water to begin falling.