South America has cold summers and hot winters, but somehow they still manage. A vibration is a motion that cannot make up its mind which way it wants to go. Genetics explain why you look like your father and if you don't why you should. We say the cause of perfume disappearing is evaporation. Evaporation gets blamed for a lot of things people forget to put the top on.
Water vapor gets together in a cloud.
When it is big enough to be called a drop, it does. Cyanide is so poisonous that one drop of it on a dogs tongue will kill the strongest man. Isotherms and isobars are even more important than their names sound. It is so hot in some places that the people there have to live in other places. The wind is like the air, only pushier.