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.