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The Water Cycle
Created by Mrs. McColgan
The Water CycleEvaporation
Sun heats water
Liquid water changes to gas (vapor)
Water vapor riseswith warm air
Humidity Amount of water
vapor, or moisture in the air
Changes with temperature
Warm air holds more moisture than cold air
Cold AirWarm Air
Measuring Humidity
Hygrometer is used to measure the amount of water vapor in the air.
The Water Cycle
Condensation
Water vapor cools
Tiny water droplets or ice crystals form
Get bigger and heavier
The Water Cycle
Precipitation
Air can’t hold up heavy water
droplets or ice crystals
They begin to fall
The Water Cycle
All the different forms of water that fall from the sky.
Precipitation
The air temperature determines the form of precipitation.
Types of PrecipitationRain Liquid Air temperature above 32 degrees FahrenheitSnow Solid Air temperature below 32 degrees FahrenheitHail Solid Formed in clouds Winds carry frozen drops higher Layers of ice are added RepeatsSleet Mixture Air temperature just above freezing
Measuring Precipitation
Rain gauge
Open container that collects precipitation
Scale on side of container shows how much has fallen
The Water Cycle
Runoff
Water that does not soak into the ground
Runs downhill into puddles, streams, rivers, or lakes
Then the whole cycle begins again
Review of the Water Cycle
