"Underground? What underground?" Duan Xue couldn't have been brain-damaged by two years of sleep! Duan Ling suddenly thought of this possibility. "Our current location is actually under the Moho interface. Well no, it's still under the mantle. Hey, it seems to be deeper than the Gutenberg interface! This is almost to the core of the earth." Duan Xuewu Frowning, he used the guide's authority in the [Lord God Space] to make some calculations, with doubts on his face. "Um, Duan Xue, can you explain to me what the 'Moho interface' and the 'Gutenberg interface' are?" Duan Ling asked with some embarrassment. "What did you do when you were in middle school?" Duan Xue glared at Duan Ling and said, "Seismic waves refer to elastic waves that are generated from the earthquake source and radiate outward. There are basic interfaces inside the earth where the velocity of seismic waves suddenly changes. Mo The Ho surface and the Gutenberg surface divide the earth's interior into three layers: the crust, the mantle and the core. That is to say, there is a significant discontinuity about 33 kilometers below the ground - this is the Moho interface. Below the asthenosphere, to the interface at a depth of about 2,900 kilometers inside the earth, it belongs to the mantle. Since the outer core of the earth is liquid, the seismic wave s-wave in the mantle cannot pass through this interface and propagate in the outer core. The speed of the interface has also dropped sharply. This is the Gutenberg interface. I really don¡¯t know what you were doing when you were in geography class. " "Ahaha, my brother is a boy. Of course he is busy with science in high school. There is no geography in the middle school of science," Duan Ling argued. "Although I was not at home when you were in high school, don't think that I don't know the situation at home. My mother told me, 'Xiaoxue, your brother is like an idiot in science, so he studied liberal arts. Alas, you said What's a big boy doing studying liberal arts? "Hey, right?" Duan Xue exposed Duan Ling's "lies" without hesitation or mercy. "Ahhahaha, this, that." Duan Ling found that his sister was not as cute as he thought. "By the way, you said we are underground, does that mean we are on the earth?" Duan Ling asked, not because he deliberately changed the topic, but because this is indeed a strange thing and an exciting one. things. "Well, yes, according to the positioning instructions given to me by the Lord God Space, we are indeed on the earth now, and underground!" Duan Xue said. "Underground!" If Duan Xue hadn't said these words, Duan Ling would have sprayed the man to death with a mouthful of salt soda. But since it was underground, how could there be sun! And there are night and day, and all kinds of things that are no different from the surface of the earth? However, since it is underground, doesn't it mean that there is a chance to return to the original world? "Duan Ling, tell me what happened recently!" "Okay!" Duan Ling nodded. Duan Xue listened to him quietly as he told him exactly what happened after he left the [HP World] and what Duan Xue did in the [Sin World] after he fell into coma. She understood that although what Duan Ling said seemed very casual and plain, the thrills and dangers of the adventure were all taken away by Duan Ling. This may be her brother's unique habit. It seems that Duan Ling has never They all report good news but not bad news. "Duan Xue, after completing the mission of the Lord God Space in the sinful world, I got 10,000 points. Look, hey, can I exchange it for something nice?" Duan Ling said. He still remembered that he could pass the points. To realize time travel. "I'm really sorry. Because of my resuscitation, I also consumed 10,000 points. In other words, your current points have been cleared again." Although Duan Xue said she was sorry, she couldn't tell at all from her expression. Guilt comes. "Ahem" Duan Ling spat out a mouthful of old blood With a sister like this, how can my brother live? "Ding. The meeting between the guide and the chosen one is complete. The final mission has begun, codename: The Last Shackles. Mission: Unknown. Completed." "Cheating!!"