UNIT 7. WATER AND AIR ON THE EARTH. Wind

Wind is moving air. 

HOT air goes up 

COLD air goes down.

The difference in air temperature causes wind, which moves air from one place to another. This is why clouds move.

Play this video. 





There are different types of wind. 

We can measure how fast the wind is coming with an anemometer.

We can find out the direction the wind is blowing with a weather vane.

UNIT 7. WATER AND AIR ON EARTH

In this unit we're going to learn about air and water on Earth. 

All living things need this. We can't see it, but it's all around us. What is it?

       
 

 


All living things need water and air to live.

WATER

Water is found in many places in and around the Earth.
It's found in three states. 

Three stages song.

Most of the water on the Earth is saltwater, and only a little is freshwater.

FRESHWATER                                                                   SALTWATER

Rivers, lakes, icecaps and groundwater.                              Oceans and seas.

Reservoirs (man-made lakes)

Groundwater speed.

AIR

Plants can't grow without air. People and animals can't breathe without air. Air is found mainly in the atmosphere, which is the layer of gases that surround the Earth.

Air is all around us but we can't see it. 
Air is a mixture of gases.



You can't see air, but you can feel.




WATER and AIR have the same characteristics: they have no smell, no taste and no colours.

 

Air takes up space.

You can see this video.

Does air have weight?