Humidity: hydrologic cycle, evaporation, precipitation, surface water runoff, groundwater, transpiration, respiration

changes of state: solid (low energy), liquid, vapor (high energy); melting, evaporating, sublimation, cooling processes, freezing, condensing, deposition, warming processes

humidty variations: vapor pressure, saturation; absolute humidity, relative humidity (likelihood of condensation), dew point (amount of moisture)

What are the three states of H₂O? What are the processes that relate these three states? Which processes release energy? Which processes absorb energy? Explain which are cooling processes and which are warming processes.

Draw and explain the hydrologic cycle. Which components of the cycle have the greatest effect on the weather? Why?

Explain relative humidity. What is its relationship to absolute humidity? What is its relationship to dew point? Which is a better indicator of the amount of moisture in the air, dew point or relative humidity? Which is a better indicator of the likelihood of fog and clouds?

Explain how relative humidity can be raised or lowered.

How is relative humidity measured?