I thinks its a layer of soil with characteristic properties, sorry if its wrong I'm a beginner
        
                    
             
        
        
        
Answer:
This could mean that the pink ball had a little bit more air in it than the blue ball. They could also have been dropped at the same time, but they were dropped on a hill, and the pink one landed first at the top of the hill, and the blue one landed second at the bottom of the hill.
Explanation:
Have a nice day! :)
 
        
             
        
        
        
I think it’s c but I’m not entirely sure
        
             
        
        
        
Cap and Trade is the equivelent to carbon footprint