What these have in common?

 Is of course..  Our Sun  Click 

 Always, always, always  Warm air rises, cold air sinks  Warm air less dense, cold air more dense

 Uneven heating causes high and low pressure. SummerWinter

 The warmer the air, the more water it holds  Why does hair do this when you go outside sometimes?  Humidity is the amount of water in the air.

 Cold air=high density=high pressure  Hot air=low density=low pressure

 Uneven heating causes high and low pressure. SummerWinter

 Pressure differences make wind and create weather!