Why is the water vapor fresh water when it rises from the ocean?

Because the evaporation is like a filter it leaves most things behind like bacteria or salt then when it comes down from the sky (or rain :P) it is safe to drink (NEVER DRINK WATER THAT IS DRIPPING OFF A ROOF!!!). but if air pollution gets into the cloud it could contaminate the vapor and turn it into acid rain which can do lots of damage.

Answer herbicide-resistant soybeans;