Answer:
12. b
13. d
14. c
15. d
Explanation:
12. Condensation generally occurs in the atmosphere when warm air rises, cools and looses its capacity to hold water vapor. As a result, excess water vapor condenses to form cloud droplets.
13. Most clouds form as warm air rises in the atmosphere and cools down. All air contains some water vapor and warm air can hold more water vapor than cold air. As warm air cools the water vapor turns into tiny droplets of water or ice. As more and more air cools down, more droplets form and they eventually become a cloud.
14. The tiny water droplets and ice crystals in clouds are just the right size to scatter all colors of light, compared with the smaller molecules of air that scatter blue light most effectively. As their thickness increases, the bottoms of clouds look darker but still scatter all colors. We perceive this as gray.
15. Water vapor can be found everywhere. It's the whole thing behind our water cycles, as such it is not only inside clouds or raindrops, but everything in our atmosphere.
