A mature thunderstorm will contain both updraft and downdrafts. The given statement is true. 
When the cumulus cloud becomes very large, the water in it becomes large and heavy. Raindrops start to fall through the cloud when the rising air can no longer hold them up. Meanwhile, cool dry air starts to enter the cloud. Because cool air is heavier than warm air, it starts to descend in the cloud (known as a downdraft). The downdraft pulls the heavy water downward, making rain.
This cloud has become a cumulonimbus cloud because it has an updraft, a downdraft, and rain. Thunder and lightning start to occur, as well as heavy rain. The cumulonimbus is now a thunderstorm cell.
 
        
                    
             
        
        
        
So that we do not contaminate it with microorganisms or garbage or other human stuff. 
 
        
             
        
        
        
Answer:
W = F * S    = Newtons * Distance = Joules (definition)
Joules and KiloJoules are obviously methods of describing energy
F = M a = kg * m / s^2       definition of force
F * S = kg * m^2 / s^2     also describes work
 
        
             
        
        
        
I think the correct answer among the choices listed above is option B. The acceleration of gravity is a constant equal to 9.8 meters per second squared.  You can see that all things fall at this rate if there is no air resistance in a system or when in a vacuum.