The correct answer is expands and cools.Concept:Temperature: It is the measure of the degree of coldness and hotness of a substance. Heat: It is a form of energy transferred between two (or more) systems or a system and its surroundings by virtue of temperature difference.Kinetic Energy: It is the energy possessed by an object due to its motion. Explanation:When air is heated, its temperature rises. This heat energy is converted into kinetic energy and molecules of gases start to move far away from each other.So, the volume of air increases or we can say it expands. Now, this hot air being light in weight moves upwards along with the water vapours. With the increase in height, the temperature starts to fall and the hot air slowly releases its heat energy into its surroundings. Thus, on moving to the higher levels of earth, the hot air expands and cools.