Transcript The Water Cycle

The Water Cycle
Section 1-3
Pages 32-35
https://www.youtube.com/watch?v=IY_Lu6e0HNo
I wonder…
Is it possible that a drop of
water that landed on your
sidewalk yesterday is the
same drop that fell on a
stegosaurus long ago?
Water Cycle
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The water cycle is the continuous
process by which water moves through
the living and nonliving parts of the
environment.
Water is naturally recycled through the
water cycle.
Water moves continuously; there is no
real beginning or end.
Water Cycle
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In the water cycle,
water moves from
bodies of water, land,
and living things on
Earth’s surface to the
atmosphere and back
to Earth’s surface.
Water Cycle
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What is the driving force behind the water
cycle?
The sun is the source of energy that
drives the water cycle.
Evaporation
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Large amounts of water
evaporate constantly
from the surfaces of
oceans and large lakes
(salt gets left behind).
Small amounts
evaporate from soil,
puddles, and your skin.
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A significant amount of
water is given off by
plants. Plants draw in
water from the soil
through their roots.
Eventually the water is
given off through the
leaves as water vapor.
This is called
transpiration.
Clouds Form
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Once a water molecule
finds its way into the
atmosphere (as water
vapor), it eventually
condenses into liquid
water forming clouds.
Blame it on the Rain
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What goes up must
eventually come down.
Water that falls to Earth
as rain, snow, hail, or
sleet is called
precipitation.
What happens to precipitation?
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Most falls directly into the ocean
Some falls on land and then it might…
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run off the land into rivers and lakes
seep into the ground
Animals may drink it, then release as a waste
product.
Plants use water to grow and produce food.
A Global Process
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For millions of years, the
total amount of water on
Earth has remained fairly
constant.
The worldwide amounts of
evaporation and
precipitation balance each
other.
Words Worth Knowing (ISN #39)
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Transpiration
Precipitation