UNIT 9UNIT 9

OUR PLANET:OUR PLANET:

THE EARTHTHE EARTH

Earth

We

Live

On

Planet

Earth.

75% of the Earth is covered with water

25% of the Earth is covered with land

The

Earth

is

surrounded

by

air

The atmosphere is the air around the earth

Theatmosphereis a mixtureof gases.

AirAir

Oxygen is necessary to breathe and live

We can’t see the air

Air is everywhere

We can feel it because the wind is the air moving

WaterWater

Water is essential for life on Earth

Water is a liquid, but…

There are different states of water:

Solid=Ice Gas=Water vapourLiquid=Water

There is water in…There is water in…Oceans and seas…Oceans and seas…The water in seas and oceans The water in seas and oceans

is is salt watersalt water..

Rivers, lakes, and under the earth, called Rivers, lakes, and under the earth, called underground waterunderground water ……

There is water in…There is water in…

The water in rivers, lakes and underground is The water in rivers, lakes and underground is fresh waterfresh water..

WeatherWeather

The weather The weather dependsdepends on different factors:on different factors:

The windThe wind

The skyThe skyThe temperatureThe temperature

……and the rainfalland the rainfall

The weather is different in each seasonThe weather is different in each season