Some oxygen molecules help fires burn while others help make water, so sometimes it's brother against brother. Some people can tell what time it is by looking at the sun. But I have never been able to make out the numbers. To most people solutions mean finding the answers. But to chemists solutions are things that are still all mixed up.
Clouds are high-flying fogs.
I am not sure how clouds get formed. But the clouds know how to do it, and that is the important thing. Clouds just keep circling the earth around and around. There is not much else to do. Water vapor gets together in a cloud.