Chapter Review:

• The moving air is called the wind.

• Air expands on heating and contracts on cooling.

• Winds carrying water vapour bring rain.

• High-speed winds and air pressure difference can cause cyclones.

• The centre of a cyclone is a calm area. It is called the eye of the storm.

• The instrument that measures the wind speed is called an anemometer.

• As warm air rises, air pressure at that place is reduced and the cooler
  air moves to that place.