1. The Water Cycle

2. Learning Points Understand how water changes state.
Understand the processes involved
in the Water Cycle in nature over time.

3. States of Water Water can exist in three different states of matter;
As solid Ice
As liquid Water
As a gas called Water Vapour

4. States of Water
Water can change from a solid to a liquid to a gas and back to a solid in a cycle.
We call this the WATER CYCLE.

5. States of Matter and The Water Cycle
Melting
Water
Ice
Evaporation
Freezing
Water
Water Vapour
Condensation

6. Can you see the Water Cycle in action in your home?

7. Evaporation
Evaporation is when liquid water turns into water vapour gas without boiling.
This happens you leave your wet washing out to dry.
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8. Condensation
Condensation is when water vapour gas cools down and turns into liquid water.
You can see this when you breathe against a cold surface.
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9. Freezing

10. Melting

11. The Water Cycle on Earth
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12. The Water Cycle
Water never stops moving. Snow and rain fall to the earth from clouds. The rain and melted snow run downhill into rivers and lakes, sometimes crashing over waterfalls.
Eventually the water flows into the ocean.
The water in the oceans rivers and lakes evaporates into the sky (atmosphere) where it forms clouds. Then the cycle begins all over again.
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13. The Water Cycle video Click here to see what happens to a
single water molecule in the Water Cycle

14. The Water Cycle Lets look at each part of the WATER CYCLE;
PRECIPITATION
CONDENSATION
EVAPORATION
TRANSPIRATION
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15. 1. PRECIPITATION
Precipitation is any water that falls from the sky to the Earth's surface.
Different forms of precipitation are rain, snow, sleet, and freezing rain.
Precipitation involves the freezing and melting of water.
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16. PRECIPITATION-GOOD POINTS
Without precipitation, all of the land on the planet would be desert and we would find it difficult to get a drink.
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17. PRECIPITATION-GOOD POINTS
Precipitation helps farmers grow crops and provides a fresh water supply for us to drink.
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18. PRECIPITATION-BAD POINTS
Precipitation can also be damaging.
Lots of rain and snow can cause flooding and lots of traffic accidents.
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19. PRECIPITATION-BAD POINTS
Hail can damage crops and cars.
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20. PRECIPITATION-BAD POINTS
Freezing rain and sleet can destroy trees and power lines.
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21. Precipitation gives us Rivers
Rivers are very important to Earth because they shape the landscape.
They provide transport and water for drinking, washing and farming.
River's collect water from the ground and return it to the ocean.
The Nile River in Africa, and the Amazon River in South America are two of the most famous rivers on Eart.

22. The River Nile
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23. The River Nile
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24. The Amazon River
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25. The Amazon River
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26. Precipitation gives us Oceans and Seas
Oceans and seas supply most of the water that evaporates and then falls as rain in the water cycle.
They are salty while rivers and lakes are freshwater.
People have used the sea for food and transportation for thousands of years.
There are four major oceans. The Pacific Ocean is the largest and covers almost half the Earth. The Atlantic is the second largest ocean.
The largest sea is the South China
Sea.
The Pacific Ocean
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27. Precipitation gives us Rainbows
Rainbows appear in the sky when there is bright sunlight and rain.
Sunlight is actually made of lots of colours. When the sun shines through a raindrop it forms a rainbow.
You can even make your own rainbow with a garden hose or water sprinkler on a sunny day.
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28. 2. CONDENSATION Water vapour cools as it rises.
When this water vapour cools it forms as clouds in the sky. This is condensation in action.
There are lots of different kinds of clouds.
Look up at the sky. How many different clouds can you see?

29. Types of Clouds

30. Condensation gives us Clouds
Clouds are the pretty white fluffs you see in the sky.
They are made up of tiny water droplets and can come in all sizes and shapes. They can be near the ground or way up high.
Sometimes, if the wind is fast enough, you can even watch the clouds move.
We would not have rain, thunderstorms, hurricanes, rainbows, and snow without clouds.
The atmosphere would be quite boring if the sky was always clear blue.
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31. Clouds are part of Thunderstorms
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Thunderstorms can cause a lot of damage. Tornadoes can uproot trees and demolish buildings. Hail can damage cars and crops. Heavy rains can create flash floods. Lightning can spark a forest fire or hurt you. Safety during a thunderstorm is really important.

32. Clouds are part of Hurricanes
Hurricanes are violent storms.
Hurricanes form over the ocean and die down when they move over land.
Scientists try to warn people about the damage caused by the strong winds, heavy rain, and storm surge.
Hurricanes are given male and female names.
Hurricane season runs from June 1st through November 30th.
Hurricane Andrew:
dg3095.k12.sd.us

33. 3. EVAPORATION
Evaporation is when water passes from a liquid to a gas without boiling.
Water that is held in lakes and rivers evaporates into the atmosphere.
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34. EVAPORATION
The Oceans of the Earth are the greatest sources of evaporation of water, which moves into the atmosphere.
Evaporation helps keep the Water Cycle going!
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35. 4. TRANSPIRATION This is the other process that
water moves from earth to the
atmosphere.
Trees, shrubs, grasses and
other plants all need water to
survive. They take up water
from the soil by their roots so
that they can grow.
Just like in the process of
evaporation the sun creates
heat which transpires this
water into the air through tiny
holes in the underside of
leaves.
apm-realty.com

36. What have you learned? What can water can be used for?
What is the name for rain which begins with P?
What is the longest river in the world?
When liquid passes from liquid to gas it is called E___________.
Condensation is when c______ are formed in the sky.
Precipitation, evaporation and condensation are all part of which cycle?

37. Click on link to try the quiz
QUICK QUIZ
Click on link to try the quiz

38. Press here to link to a movie on the Water Cycle.
Let’s watch a video!
Press here to link to a movie on the Water Cycle.

39. WATER CYCLE EXPERIMENTS CLICK HERE FOR SOME WATER CYCLE EXPERIMENTS

40. The end.