Who has an explanation? The kind with the author! !

High school explanatory text: introduction of water

Author: Fan

Water is constantly flowing and changing. It breeds life; It moistens the earth; It is a good friend of mankind.

Water consists of hydrogen atoms and oxygen atoms. Each water molecule contains two hydrogen atoms and one oxygen atom, and the molecular formula is H2O. Pure water is a colorless, odorless and transparent liquid under normal circumstances. All over the world. Of course, it is also on us. Modern medical scientists tell us that 70% of water in human body and 90% of water in vegetables. The human body can live without eating for several days, but if it doesn't drink water for several days, the consequences will be unimaginable.

Water also has a temper, which is fickle. When it's hot, the water will silently turn into steam and run away. Where did it go? It will float in the sky like a cloud. Sometimes cold air will turn into rain and trickle back to the ground. But if it encounters cold weather, it will turn into a snowflake and fly leisurely. After the sun came out, it evaporated again and again, as if water was constantly changing at different temperatures.

Water has a wide range of uses. In our daily life, when we are thirsty, we should drink water, when our clothes are dirty, we should wash them with water ... everything uses water. Without water, we humans can't live. We can use water to generate electricity, so that every household has light; Water can irrigate farmland, make crops, fruits and vegetables grow well and make farmers get a bumper harvest, so that we can eat delicious vegetables. Water can help ships navigate. Sometimes the train takes several days, but if you go downstream by boat, it only takes one day to get there. In a word, the use of water can benefit generations.

Having said that, a thousand words can be summarized in one sentence. Let's cherish every drop of water around us and save every drop. Water contains infinite power.