qOver 70% of the planet is covered by water
qWater is unique in that it can simultaneously exist in all three states (solid, liquid, gas) at the same temperature
qWater is able to shift between states very easily
qThe hydrologic cycle refers to the regular cycle of water through the earth-atmosphere system
qLiquification of water occurs frequently at normal Earth temperatures
–Occurs when air is
saturated with respect to water vapor
–The addition of water
vapor, or the lowering of temperature, in saturated air will lead to condensation