What's the use of sunshine?

1. As an energy source, sunlight is inexhaustible.

The reserves can be said to be inexhaustible (about 5 billion years). It will not produce waste gas to pollute the environment, so people pay more and more attention to it. Developing solar water heaters can not only save electricity and gas, but also save water, with many benefits.

2. the influence of sunlight on human body, promoting digestion and absorption of vitamin D.

Sunlight on our skin will dilate subcutaneous blood vessels, increase the excretion and resistance of toxic substances, increase the secretion of saliva and gastric juice, strengthen gastrointestinal peristalsis, and promote appetite and digestion.

When the skin is exposed to sunlight, it can also make vitamin D from some chemicals, such as ergot and cholesterol. This vitamin, calcium and phosphorus are important components of our bones. Without them, we would get rickets.

Sunshine is more important for children, because they are growing and developing rapidly, and the development of bones plays an important supporting role for the whole body. Once the lack of sunlight makes body form vitamin D, the child's development will definitely have serious problems.

3. The effect of sunlight on the earth's ecology and energy supply.

The energy on the earth depends directly or indirectly on sunlight. Green plants can convert sunlight into chemical energy, plants can be eaten by animals, and herbivores can be eaten by carnivores. Therefore, based on the relationship of nutrition, all kinds of creatures in the environment are linked together and become a food chain.

4. Important role for the earth and mankind.

The circulation of the earth's atmosphere, the alternation of day and night with the four seasons, and the changes of the earth's temperature and warmth are all the results of the sun. For astronomers, the sun is the only star that can observe the surface details. By studying the sun, we can infer the characteristics of other stars in the universe. In fact, the sun is the only star that we can see the surface details, and most of our knowledge about stars comes from the sun.

5. Sunshine, Mother of the Earth

Is the mother of the earth.

It is sunshine that makes the earth full of vitality; The wind blows wildly, the river flows, flowers bloom and fruits ripen, and life is endless. The sun is an inexhaustible source of energy. At present, people are trying their best to make use of solar energy.

In the 1970s, the number of meteorological observation stations increased, and it was found that the eastern Sahara desert had the most sunshine, with an average annual sunshine hours of 4,300 hours. In other words, you can see the bright sunshine for about 1 1 hour for 45 minutes every day.

Why is there so much sunshine in the East Sahara Desert? Because this is the driest place in the world, there is no cloud that can block the sun; Coupled with the low latitude and long sunshine time, it has become the place with the most sunshine in the world.