Answer:
There is a term "atmospheric circulation". It is when the air throughout the globe moves around. When the sun heats air near the equator more, and less at the poles. So the equator is warmer. The warm air near the equator moves either towards the south or the north, toward the poles. The warm air also rises up, and the cold air sinks. This is convection, but at a global scale. THis is also the cause of wind.
 
        
             
        
        
        
What subject? Is it it could be for anything
        
             
        
        
        
Both because having a balanced meal plant is worth alot in the end but if your a vegetarian you would eat only plants as far as being more efficient id say the balanced meal
        
             
        
        
        
Solid. it's all stuck and linked together, while liquids are flowing along and gases fly around wherever they please. Hope this helps