Protect the earth on which we live.
Is everyone’s responsibility.
Now we should also pass on this sense of responsibility to the children.
heretofore
Let’s learn about the origin of Earth Day!
The World Earth Day, that is, April 22nd every year, is a festival specially set up for world environmental protection, aiming at raising people’s awareness of existing environmental problems, mobilizing people to participate in the environmental protection movement, and improving the overall environment of the earth through a green and low-carbon life.
The word "Earth" in English originated from "Erda" in Anglo-Saxon (Old English), which means "ground" and "soil". Although the name is "ground", 71% of the earth’s surface is covered with water.
The mass of the earth is 5.975× 10 24 kg. Today, it is still accumulating comets, meteorites, cosmic dust and interstellar molecules in space. According to experts’ estimation, the earth can get about 100,000 tons of interstellar matter every year, including 23,430 tons of cosmic dust. Therefore, the earth grows a little fatter every year.
Since the birth of the earth from chaos 4.6 billion years ago, more than 1 trillion species have lived and multiplied on it. How many living things are there on the earth now? Go to the small garden in front of the door and dig a spoonful of soil with a spoon. There are more organic organisms living there than there are people on the earth.
About 620 million years ago, the earth’s day was only 21.9 hours. It can be seen that the rotation speed of the earth is gradually slowing down, but for us, the range is negligible-only 70 milliseconds every 100 years, so we have to wait another 100 million years if we want an extra hour in the day of the earth.
In history, there have been many magnetic pole reversals on the earth, from north to south and from south to north, and the most recent one was 780,000 years ago. Some scientists suspect that the reversal of the earth’s magnetic pole was the cause of ancient biological extinction.
Thanks to Jupiter, our earth can survive safely in the universe. Jupiter is big, massive, rotates fast, and its gravity is bigger than that of ordinary planets. The meteorites that originally flew to the earth were attracted by Jupiter and crashed into it one after another.
The earth is the only known planet with plate structure. Seven huge plates are moving in different directions, shaping the ever-changing geological features on the earth. Although it only moves 1-10 cm a year, the global carbon cycle depends on it by a few centimeters a year, so as to prevent the earth from overheating.
Man’s exploration of space has never stopped since ancient times. However, with the launch of satellites and space stations, there are more and more space junk. In 2014, a NASA data said that there were 2,600 failed but in-orbit satellites floating over the earth, twice as many as working satellites. According to the statistics of American space monitoring network, there are 26,000 objects in orbit over 10 cm, and 50,000 objects over 1-10 cm, most of which are space junk.
The water in ninety-seven percent on the earth is salt water. Of the remaining 3% fresh water, 70% is frozen in polar regions, and most of the rest is in soil or deep underground which is difficult for human beings to draw.
About 300 million years ago, almost all the land on the earth was a whole. During the Jurassic period, Pangea split into two continents, and with the passage of time, they split into what they are now.
The earth is our common home.
Each of us should have the responsibility to protect it.
Keep it from getting hurt.
世界地球日主题宣传活动周之际，
自然资源部宣传教育中心
策划制作了系列宣传海报，
倡议全社会尊重自然、
顺应自然、保护自然，
积极践行习近平生态文明思想。
（海报设计：崔家乐 刘圣媛 谭诗骑）
来源 | 综合自自然资源部宣传教育中心、口袋幼师、中国教育报等
责任编辑 | 赵利