WATER AND AIR ON EARTHWATER AND AIR ON EARTH

All living things need water and air to live.

All living things need water and air to live.Water is found in many places and in three

states: solid, liquid and gas.Water is found in many places and in three

states: solid, liquid and gas.

Most of the water on Earth is saltwater

and only a little is freshwater.

Most of the water on Earth is saltwater

and only a little is freshwater.Oceans and seas are saltwater.

Rivers, lakes, icecaps and ground waterare freshwater.

Plants can’t grow without air.

Plants can’t grow without air.

Air is found in the atmosphere.

The atmosphere is the layer of gases that surrounds the

Earth

Air is found in the atmosphere.

The atmosphere is the layer of gases that surrounds the

Earth

People and animals can’t breathe without

air.

People and animals can’t breathe without

air.

Air

Characteristics of air

Air is a mixture of gases, but it consists mainly of oxygen and nytrogen.

Air and water have the same characteristics:Air and water have the same characteristics:

They have no smellThey have no smell

They have no tasteThey have no taste

And they have no colourAnd they have no colour

WIND

Wind is moving air.

Hot air goes up and cold air goes down.

The difference in air temperature causes

wind which moves air from one place to

another.

This is why clouds move.

Wind is moving air.

Hot air goes up and cold air goes down.

The difference in air temperature causes

wind which moves air from one place to

another.

This is why clouds move.

TYPES OF WINDTYPES OF WIND

There are different types of wind. When there is no wind, we say it is CALM.A little wind is called a

BREEZE.A GALE is a strong wind.A HURRICANE is a very

strong wind.

There are different types of wind. When there is no wind, we say it is CALM.A little wind is called a

BREEZE.A GALE is a strong wind.A HURRICANE is a very

strong wind.

We can measure how fast the wind is moving with an

ANEMOMETER.

We can find out the direction the wind is

blowing with a WEATHER VANE

How can we measure wind?

How can we measure wind?