1. What these have in common?

3.  Is of course..  Our Sun  Click 

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

5.  Uneven heating causes high and low pressure. SummerWinter

6.  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.

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

8.  Uneven heating causes high and low pressure. SummerWinter

9.  Pressure differences make wind and create weather!