2. A.Humidity A measure of the amount of water vapor in the atmosphere is called __________. Air can hold only so much water vapor. However, _______ air can hold more water vapor than _______ air. When a meteorologist (weather person) talks about this, they are usually talking about _______________________. This is the _____________ of water vapor that is actually in the air compared to how much water vapor the air can hold at a certain temperature. The parts of the water cycle: _______________________

3. B. How Clouds Form Clouds are made from millions of tiny ________________ or ______________. When water vapor in the air ___________ into a liquid or solid, clouds form. To accomplish this, two conditions must be present: __________ and the presence of ____________ in the air. When air is cold, it holds less water vapor, so cooling warm air causes it to ___________. The temperature this occurs at is called its ___________. If this temperature is above freezing, water forms as a ________. Below freezing, it can change into _____________. To condense, however, ________________, like ______, ______, or _________ must be there to condense on.

4. D. Your Turn Although I already knew, by focusing on the lesson, I learned and. A question I would still like answered is.