Air


Air is the mixture of gases that surrounds the Earth.images (3).jpeg

The main gases in air are:

• Nitrogen (the most abundant gas)

• Oxygen. (Plants produce oxygen and all living things need oxygen to breathe).

• Carbon dioxide. (Living things produce carbon dioxide when they breathe out. It is also produced by cars and factories).



We need air for

Breathing

RESPIRAR.jpeg

Hearing.

Sound travels through air.

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Flying.

Birds, butterflies and aeroplanes cannot fly without air.

volar.jpeg

Burning.

Fire needs oxygen from the air in order to burn.images (5).jpeg

The properties of air

  • Air is invisible.

  • It has no colour or smell.

  • It has no shape or volume of its own.

  • Air has weight. A balloon with air inside weighs more than a balloon with no air inside.images (6).jpeg

  • Air occupies space. If you inflate a balloon, it changes its shape because of the air inside.

  • Air does not have its own shape.


The atmosphere



external image atm_intro1_240.jpg

external image atm_intro2_240.jpg

LAYERS OF THE ATMOSPHERE


atmosphere.jpg
atmosphere.jpg


Watch these videos to learn about our atmosphere:






























Para saber más:http://www.geography4kids.com/files/atm_intro.html