easily and freely - Science for elementary school, middle school and
Free online chemistry
lesson for elementary school, middle school and high school.
The water cycle
about the water cycle
Water is present in nature under
many different and temporary forms. All changes that may affect
water in nature contribute to the water cycle.
( diagram: an example of water
Steps of water cycle
Step 1: Under the influence of Sun and winds, the water from oceans,
(and all the reserves of liquid water in the open air) undergoes a
Note: All trees and plants also produce water vapor (this phenomenon is
Water vapor, invisible to the naked eye, rises into the atmosphere.
Step 3: In contact with a
layer of cold air, water vapor becomes liquid
and forms clouds made of tiny water droplets.
Step 4: Pushed
by the winds, clouds reach the inland.
Step 5: When the
form the clouds become
too heavy they finally fall and form
Step 6: Once on the
ground, the water from precipitations may flows or it
can also penetrate the soil (it infiltrates).
Step 7: At high
altitudes, temperatures can become very low. The droplets
that form clouds solidify to form ice crystals.
Step 8: When ice
crystals combine to form heavier snowflakes, they fall
and form some snow.
Step 9: If the snow
falls on mountains high enough it can feed a glacier
or forms a snowpack.
Step 10: Fusion of snow and glaciers gives birth to rivers that may
join a lake.
Step 11: The groundwater fed by rainwater that infiltrates the ground
may spray out at the surface as source that give birth to a river.
Step 12: The rivers flow into other rivers and finally reach a sea or
more about water cycle
explained to kids with worksheet to download.
water cycle - Water science for school:
The water cycle ( also called hydrologic cycle ) explained with a
beautiful and detailed diagram.
Flash water cycle: animated flash
water cycle that explains vapor, clouds, rain and water storage.
Earthguide - water cycle diagram:
another animated diagram that shows how water moves in nature and its
South east water - water cycle game:
an interactive game to learn different steps of water cycle
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