Why is this the answer?

The answer is lantern because this clever riddle describes the different parts of a lantern and what it does. A lantern is a special kind of portable light that people carry or hang up to help them see when it is very dark outside, like at night or inside a cave. Let's break down the first clue: "Iron roof, glass walls." If you look at a classic old-fashioned lantern, you will see a sturdy top part that is often made of metal, like iron, to make it strong. That is the "Iron roof." It sits over the flame and keeps it safe from things falling onto it, and sometimes it has little holes to let the hot air escape. Below the roof, the lantern has clear sides made of glass, which are the "glass walls." These walls are key because they allow all the bright, helpful light to stream out so a person can see where they are walking. But the glass also acts like a protective shield, keeping the precious little flame safe from outside dangers. The next part of the puzzle says the object "burns and burns." This clue refers to the fire itself. Inside the protective glass walls, there is a small light source, maybe a candle or a wick soaking up oil. That light source is burning, giving off the light. It can burn for many hours, which is why the riddle says it "burns and burns." Finally, the riddle says the burning thing "never falls." This is the trickiest part! It does not mean the entire metal box can never be dropped on the ground. It means that the flame inside is protected so well that it never "falls" or goes out because of a gust of wind, a little bit of rain, or being jostled while you carry it. The strong walls and roof keep the air still around the flame, making sure the fire stays lit, even if you move quickly. A lantern is a beautifully designed, strong little house that safely holds fire and light for a long time. It helps us explore the dark without worrying about the fire disappearing.