48. Which best describes how air moves during convection? A.Cool air falls down B.Warm air falls down C.Cool air is replaced by warm air D.Air always falls down
Option A Solution: In convection, hot air rises from the Earth's surface and becomes cold at higher altitude because of lower temperature there. As it cools, it sinks down to the surface of the Earth. On reaching Earth, it warms again and rises up again. The main reason for this phenomenon is - sinking cold air pushes the warm air up.
