Writing ideas: write down a scientific topic in detail and use various interpretation methods when writing.
Nowadays, science has long been the hottest topic discussed by modern people. The door waved to me again and I walked in without hesitation.
Now, I want to talk about a topic-air.
Air, everyone should know what it is. And I also learned from some books that the air on the earth is about 1/5 oxygen, 4/5 nitrogen, and a small amount of other gases, such as carbon dioxide and water vapor. Clean air is colorless and tasteless, which sustains the life of all things on earth.
The atmosphere around the earth is about 1000 km thick, but only the air below the earth's surface is dense and active, and wind, frost, rain and snow all occur here. The farther away from the earth, the thinner the air is. Children in Beijing will feel that there is not enough oxygen when they go to the Qinghai-Tibet Plateau, and it will take some time to get used to it.
There is an ozone layer 16-32km above the ground, which can protect the living things on the earth from the strong ultraviolet rays of the sun.
Animals living in water, some often surface to breathe air, and some breathe air dissolved in water. People can do many things with compressed air. For example, a hovercraft uses the air compressed by a blower to form an air cushion under the hull to lift the hull and make the ship "fly" on the rough sea.
Students know about air. When I grow up, I want to make the air serve mankind more!