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 is the movement of water from the atmosphere to the Earth's surface. Precipitation in the form of rain, snow, sleet, or hail is the source of nearly all the fresh water in the hydrologic cycle. Precipitation. Water that falls to Earth as precipitation follows many paths on its way back to the atmosphere.