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Review notes for Thursday's quiz. Focus on the four main processes and the energy that drives each one.
Heat from the sun turns liquid water in oceans, lakes and rivers into water vapor. Warmer temperatures and wind speed up evaporation.
As water vapor rises it cools. Cooler air holds less vapor, so the vapor condenses onto tiny particles of dust and forms clouds. The same thing happens when droplets form on the outside of a cold glass.
Cloud droplets join together until they are heavy enough to fall as rain, snow, sleet or hail.
Water gathers in oceans, lakes, rivers and underground aquifers, where the cycle starts again.