The air surrounding us is important to everyone. Without air, we could not exist. Everyone understands that. But air is ecessary in many other ways-- ways that are not always so obvious or widely known.
For example, if we did not have air, there would be no sound, because sound travels through air. Without air there would be no fire. There would be no automobiles, since motors need air in order to operate.
Without air, there would be no wind or clouds. There will be no weather. The night time would be very cold and the day time very hot. We woud be forced to seek shelter from the sun, as there would be no atmosphere to protect us from the sun's deadly rays.
The atmosphere is all the air surrounding the earth. Atmospheric pressure is the weight of all the air against the surface of the earth. Many things on earth can not do without atmospheric pressure, as everyone knows. I won't give further examples.
In one word, we can not live without air.
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