We are living on the surface of the Earth. 我们生活在地球表面。

　　So, what is inside the Earth? 那么，地球内部是什么？

　　There is a mantle under the surface of the Earth. 地球表面以下是地幔。

　　The mantle takes up 84% of the Earth. 地幔占地球体积的84%

　　It is a rocky layer, and it covers the core of the Earth. 它是岩层，包裹着地核。

　　The mantle near the surface is like a bunch of hard rocks. 靠近地表的地幔就像一堆坚硬的岩石。

　　But the mantle near the core is boiling liquid rocks. 而靠近地核的地幔是炽热的岩浆。

　　When a volcano erupts, this boiling mantle comes out. 火山喷发时，炽热的地幔随之而出。

　　Also, the mantle heats up undergroud water. 而且，地幔会加热地下水。

　　Thanks to the mantle, we can enjoy a hot spa. 多亏有了它，我们才可以享受温泉。