Okay, little buddy! Let's talk about dumpers. You know, those big trucks that help carry things like dirt or rocks? Well, dumpers don't have a roof on top. That means you can see the sky above them when you look inside!
Now, let’s understand why. If dumpers had roofs, it would be hard for them to dump the stuff they carry out. They lift their big backs and let everything fall out. If there was a roof, nothing could come out!
Also, when it's sunny or windy, the open top lets fresh air in, and when it rains, the driver usually can manage to keep the stuff dry by using a cover sometimes. So, not having a roof helps them do their job better!
So remember, no roof means they can dump all their stuff easily and do their job well! How cool is that?