Why is this the answer?

The answer is umbrella because this is a super clever riddle that uses a wonderful word trick to describe something we use to stay nice and dry. It wants you to picture an action that happens at the exact same moment as a natural event. Think about what happens right before you step outside into a big rainstorm. The rain is pouring down from the sky, and you certainly do not want to get soaked. You grab your colorful umbrella right away! The riddle has two main parts: "goes up" and "rain comes down." The "rain comes down" part is easy to picture. It is the rain falling from the clouds. The tricky part is "What goes up." When you are ready to use an umbrella, you cannot leave it closed. You have to open it up. Most umbrellas have a button or a slider you push. When you push this part, the fabric top of the umbrella quickly slides up the metal pole. That fabric part, which is called the canopy, goes up above your head to make a perfect shield. It makes a little roof over you! The riddle is playing a word game because it makes you think of something huge, like a hot air balloon or an airplane, that is always moving up, up, up. But the answer is actually an ordinary object that you move up very quickly to protect yourself. The umbrella's job is to catch all the water falling down and keep it far away from your clothes and your hair. Without that simple "up" motion to open it, you would be completely wet. It is an amazing and important tool for every rainy day. Every time you hear the pitter-patter of raindrops, remember the clever trick: the water comes down, but your small, personal roof goes up!