Question

which best describes how air moves during convection?
a. warm air cools as it mixes with cooler, denser air.
b. warm air is displaced by cooler, denser air.
c. cool air warms as it mixes with denser air.

Explanation:

In convection, warm air rises as it is less dense than cooler air. Cooler, denser air then moves in to replace the rising warm - air. This is the process of displacement. Option A focuses more on the cooling due to mixing rather than the overall movement pattern of convection. Option C is incorrect as cooler air doesn't warm by mixing with denser air in the context of typical convection - related movement.

Answer:

B. Warm air is displaced by cooler, denser air.