u65b0u5efa DOC u6587u6863 (3).doc - Where does the heat...

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Where does the heat inside the earth come from? Scientists found that the sun and the earth were formed 4.6 billion years ago, when roughly, the formation of the earth had experienced the process of from small to large, continuous impact and volume growth [2]. In a long period, the earth was continually hit by a large number of meteorites. During this process, gravitational potential energy from all kinds of small celestial collisions was transformed into heat energy, which resulted in that the earth became a lava planet at that time. The surface temperature was as high as 2-3000 degrees Celsius, and the core temperature was even higher than now. The earth then cooled, and crust, mantle, and core were formed. Although the earth has been cooling for 4.6 billion years, there is still a lot of heat stored inside. The earth's interior is very hot, but apart from natural phenomena such as volcanic eruptions and hot springs, we can hardly feel it on the earth's surface. This is because of the protection of the

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