In what ways does the sun introduce the sun?

The sun introduces the sun from the aspects of distance, volume and temperature.

The original text of the primary school text "The Sun"

There is a legend: in ancient times, there were ten suns in the sky, which made the ground barren. People couldn't stand the heat, so they found a good archer to shoot off nine, leaving only one, so that the ground was not so hot. In fact, the sun is1.500 million kilometers away from us. Going to the sun, if you walk around the clock, it will take almost 3.5 thousand years; Even by plane, it will take more than twenty years. How can you shoot an arrow so far away?

When we look at the sun, we think it is not big. In fact, it is very big, and only1300,000 earths can be worth a sun. Because the sun is too far from the earth, it looks as big as a plate.

In fact, the sun will glow and heat, which is a big fireball. The temperature of the sun is very high, and the surface temperature is 6000 degrees Celsius. Even if steel touches it, it will turn into steam. The central temperature is estimated to be three thousand times the surface temperature.

Although the sun is far away from us, it has a very close relationship with us. With the sun, crops and trees on the earth can sprout, grow leaves, blossom and bear fruit; Birds, beasts, insects and fish can survive and reproduce. If there were no sun, there would be no plants and animals on the earth.

The grain, vegetables, fruits and meat we eat and the cotton, hemp and silk we wear are closely related to the sun. Buried coal seems to have nothing to do with the sun, but its formation is inseparable from the sun. Because coal is made from plants buried underground in ancient times.

After the water on the ground is exposed to the sun, it absorbs heat and becomes countless steam. When water vapor meets cold, it condenses into countless small water droplets, floats in the air and becomes clouds. More and more water droplets gather in the clouds and turn into rain or snow.

The sun shines on the ground, and some areas absorb more heat, so the air there is hotter; Some areas absorb less heat, where the air is colder. Air can only flow when it is cold and hot, and it can become wind.

Sunlight has the ability of sterilization, and we can use it to prevent and treat diseases.

Both light and heat on the earth are emitted by the sun. Without the sun, the earth is dark and cold everywhere, without wind, snow, rain and dew, grass, trees, birds and animals, and naturally there is no one. In short, without the sun, there would be no beautiful and lovely world for us.