Why does it only rain and not catch fire? What will happen if it becomes a fire in the sky in the future?

It rains because the water on the surface evaporates in the air, gathers into clouds and then condenses and falls. Fire is not a specific substance, but a phenomenon. It should be said that it fell into a burning substance. However, if a solid is falling, it will rub against the air, so when it hits the ground, it will be as big as a basketball in the air.

On the other hand, if it doesn't rain, solids will have a lot of energy when they hit the ground, just like meteorites. Because of its high speed and high energy, the consequences are self-evident.

Finally, if it doesn't rain and water can't circulate, it will cause drought and human plants will become extinct.