Compare freezing and boiling point of Fahrenheit and Celcius. The thermosphere, the highest layer of our atmosphere, is constantly bombarded by unfiltered solar radiation. It has an extremely high temperature, because individual molecules vibrate at high speeds. However, there are so few molecules up there that the heat content is very small. Heat always flows from hotter to colder objects.
Conduction is most effective in solids and liquids, less important in gases.
C. Convection - heat transfer caused by the organized flow of many molecules from one place to another. Convection is responsible for most of the heat transfer in our atmosphere and oceans. D. Change of state of water 1. Water is a rare substance, because it can exist in all three states of matter at normal earth surface conditions. When water changes states of matter, enormous amounts of energy are involved.