Glossary
Water Cycle
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Water Cycle (hydrological cycle)
WATER CYCLE
The process by which water is continually recycling
between the Earth’s surface and the atmosphere.
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Evaporation
EVAPORATION
When water changes from a liquid to a gas.
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Condensation
CONDENSATION
When water changes from a vapor to a liquid.
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–17–
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Precipitation
PRECIPITATION
Any form of water (rain, hail, snow) that falls to
the surface of the Earth from the atmosphere.
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Collection
COLLECTION
Once water has fallen to the Earth as precipitation,
it runs into surface bodies such as streams, lakes
and oceans, or seeps into the ground.
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Clouds
CLOUDS
Droplets of water that condense on tiny particles of
dust and other solid matter in Earth’s atmosphere.
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–18–
Thermometer
An instrument that
measures the air
temperature
Barometer
An instrument that
measures air pressure
Rain Gauge
An instrument that
measures the amount of rain
that has fallen over a specific
time period
Wind Vane
An instrument that
determines the direction
from which the wind is
blowing
Anemometer
An instrument that
measures wind speed
Hygrometer
An instrument that
measures the water vapor
content of air and humidity