presentación earth, air, weather, pollution
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UNIT 9UNIT 9
OUR PLANET:OUR PLANET:
THE EARTHTHE EARTH
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Earth
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We
Live
On
Planet
Earth.
75% of the Earth is covered with water
25% of the Earth is covered with land
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The
Earth
is
surrounded
by
air
The atmosphere is the air around the earth
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Theatmosphereis a mixtureof gases.
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AirAir
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Oxygen is necessary to breathe and live
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We can’t see the air
Air is everywhere
We can feel it because the wind is the air moving
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WaterWater
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Water is essential for life on Earth
Water is a liquid, but…
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There are different states of water:
Solid=Ice Gas=Water vapourLiquid=Water
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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..
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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..
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WeatherWeather
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The weather The weather dependsdepends on different factors:on different factors:
The windThe wind
The skyThe skyThe temperatureThe temperature
……and the rainfalland the rainfall
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The weather is different in each seasonThe weather is different in each season