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, which is the falling of water back to the ground after condensing in the atmosphere, occurs all over Earth and in many different forms. A heavy downpour, a light drizzle, snow, sleet and hail are all types of precipitation. Be it falling liquid water or falling ice, it's all the same process. Precipitation can only occur after condensation, which is when water turns from a gas to a liquid. The atmosphere is filled with water vapor, which is water in a gaseous state. Sometimes this water vapor cools and builds up on dust particles in the atmosphere, forming a cloud.