Water and UsWater and Us..

Aim: To find out what the hydrological cycle is and how it works.Aim: To find out what the hydrological cycle is and how it works.

Water FactsWater Facts

•About 66% of your body is made up of water.About 66% of your body is made up of water.•Water helps us to digest food and get rid of waste.Water helps us to digest food and get rid of waste.•Keeps your skin healthyKeeps your skin healthy•Stops bones from grinding togetherStops bones from grinding together•Stops your eyes from drying outStops your eyes from drying out•Body temperature is controlled by water.Body temperature is controlled by water.•A living tree is 70% waterA living tree is 70% water•A tomato is 90% water. A tomato is 90% water.

Water can be stored on earth..Water can be stored on earth..

Sea Air On Land

And comes in the form of..And comes in the form of..

Rain

Snow

Ice

The The Hydrological Cycle. Cycle.

Click on image to Click on image to see clipsee clip

Click title for google video on Water Cycle. Start on 5mins 40 secs

The Hydrological Cycle.The Hydrological Cycle.

EvaporationEvaporation• Evaporation:   Evaporation is when the sun

heats up water in rivers or lakes or the ocean and turns it into vapour or steam. The water vapour or steam leaves the river, lake or ocean and goes into the air.

CondensationCondensation

Condensation:    Water vapour in the air gets cold and changes back into liquid, forming clouds. This is called condensation.

You can see the same sort of thing at home... pour a glass of cold water on a hot day and watch what happens.  Water forms on the outside of the glass.  That water didn't somehow leak through the glass!  It actually came from the air.  Water vapour in the warm air, turns back into liquid when it touches the cold glass.

PrecipitationPrecipitation

Precipitation:  Precipitation occurs when so much water has condensed that the air cannot hold it anymore.  The clouds get heavy and water falls back to the earth in the form of rain, hail, sleet or snow.

CollectionCollection

When water falls back to earth as precipitation, it may fall back in the oceans, lakes or rivers or it may end up on land.  When it ends up on land, it will either soak into the earth and become part of the “ground water” that plants and animals use to drink or it may run over the soil and collect in the oceans, lakes or rivers where the cycle starts

…..all over again!

Have a guess.Have a guess.

If the water cycle stopped If the water cycle stopped tomorrow, how long would we tomorrow, how long would we have before water ran out?have before water ran out?

4 Weeks !4 Weeks !