Famous quotes about cherishing water resources are as follows:

1. Please cherish every drop of water.

2. Relying on mountains to eat mountains, relying on water to eat water

3. Only those who are quiet in the world can see the subtleties and know it. The moon is hazy and windy, and the base is moist and rainy. ——Su Xun of the Song Dynasty, "On Debate on Adultery"

4. The accumulation of dust and feathers will sink the boat and break its axis. ——Jin Ge Hong's "Baopuzi Jia Dun"

5. When water comes, stretch out your hands, and when rice comes, you open your mouth.

6. When you see a fallen leaf, you know the end of the year; when you see ice in a bottle, you know how cold the world is. ——Han Dynasty Liu An's "Huainanzi·Shuo Shan Xun"

7. If you are envious of fish in the depths, it is better to retreat and build a net. ——"Book of Han·Biography of Dong Zhongshu"

8. There are no quiet trees in the mountains, and the rivers never stop flowing. ——"Shishuoxinyu·Literature"

Water:

Water is one of the most common substances on the earth. About 71% of the earth's surface is covered by water. It is an important resource for the survival of all life, including inorganic compounds and humans, and is also the most important component of living organisms. Although its content in the air is small, it is an important component of the air. Pure water has very weak conductivity and is a very weak electrolyte. Water in daily life has more obvious conductivity because it has more anions and cations dissolved in other electrolytes.

Exogenous theory:

As the name suggests, the exogenous theory believes that the water on the earth comes from outside the earth. One candidate for an alien source of water is comets and water-rich asteroids. Comets known as "dirty snowballs" are composed of water and interstellar dust. When a comet hits the Earth, it will bring a large amount of water. Some water-rich asteroids landed on the earth and became meteorites, which also contain a certain amount of water, generally 0.5% to 5%, and some can reach more than 10%. Among them, carbonaceous chondrite meteorites contain more water.

Water rock:

Earth scientists tend to believe that the water on the earth comes from magma water during the earth's own evolution, while astronomers are more inclined to believe that the water on the earth is caused by the impact of comets and other objects on the earth. of water. Neither point of view convinced anyone.

Many people seem to think that water is rare in space. In fact, water is very abundant in the solar system. For example, on our neighboring planet, Mars, many dry river beds, lakes, deltas, alluvial fans, etc. have been found on its surface, which shows that there was once a large amount of water on the surface of Mars.