Which is a unique feature of mercury? a. it is the smallest planet and has the shortest period of revolution around the sun. b. the thick atmosphere—made mostly of carbon dioxide—absorbs solar radiation, heating up and make the atmosphere very hot. c. the planet’s surface is covered with red, iron-oxide dust. d. it is the only planet with permanent liquid w

answer; i believe that the correct answer is (light);

answer: ice crystals in air

the water from the water body or another source of water gets evaporated as water vapor as an effect of heat on water. these water vapor rises in the upper layers of the earth atmosphere under high atmospheric pressure. the atmospheric pressure of these water molecules starts to decrease due to the effect of cold air. the invisible water vapor condenses into visible water droplets and ice crystals.these ice crystals and water droplets being less denser than the surrounding air floats on air as clouds.