What is the average radius of the earth?

The average radius of the earth is about 637 1 km.

The earth is1.500 million kilometers away from the sun. The earth rotates from west to east and revolves around the sun at the same time. 4-4.6 billion years ago.

It has a natural satellite-the moon, forming a celestial system-the earth-moon system. It originated from the primitive solar nebula 4.6 billion years ago. The equatorial radius of the earth is 6378. 137 km, the polar radius is 6356.752 km, and the equatorial circumference is about 40076 km. It is an irregular oval sphere with slightly flattened equator and slightly protruding poles. The surface area of the earth is 5 1 100 million square kilometers, of which 7 1% is ocean and 29% is land.

Land and sea distribution of the earth

The total area of the earth is about 5,654.38+00072 million square kilometers, of which land accounts for 29.2% (6,543.8+48.94 million square kilometers) and the rest 70.8% (3,665.438+032 million square kilometers) is water. The land is mainly in the northern hemisphere.

There are five continents: Eurasia, Africa, America, Australia and Antarctica, and there are many islands. The oceans include the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Arctic Ocean, the Southern Glacial Ocean and their affiliated sea areas. The coastline is * * * 356,000 kilometers.

Climate: Because the earth's climate has changed greatly since ancient times, and this change will continue to evolve, it is difficult to summarize the earth's climate. Natural disasters related to weather and climate on earth include tornadoes, typhoons, floods and droughts.