The atmosphere surrounding the Earth is full of air. The air is made from molecules of different gases. The most common gases are Oxygen and Nitrogen they are about 21% of Oxygen and 78% of Nitrogen. All life in Earth (including animals and plants) need air. We need breath in air to get Oxygen to keeps alive. To photosynthesis, Plants need gasses from air. To survive, Animals need air to get the oxygen.
Some time we can't (hardly) notice the air all around us because we cannot see, touch or taste it. We can feel air when it move and see the effect it has on othet thing, but it's difficult to investigate.
In this section some experiment will help you to investigate air.
Section I : AIR
Thursday, November 23, 2006
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment