And that is an excellent argument against claims that he knows something that we don't. The cited portion is something that only a child can come up with. It explains nothing. For example, "the upper layer of solid metal" - just as Fenimore Cooper, he omits important details - what metal? Then, "the second layer of rubber" - rubber is an Earth-specific material, made from either the juices of some plants, or from oil. Does he imply that those plants and that oil are also present on other planets? And "the last layer with magnetic properties" - isn't it also a metal, since not many non-metals are ferromagnetic? Again, an important omission of details - something that a true ET would not make. If I were to be transported a century back, for example, I'd certainly mention *specifics* of things that I pretend to know. One word would be enough to prove that I know what I speak of. Up to 1865 I could, for example, mention that benzene molecule is a ring - nobody would know that.
There was a catastrophe on Mars where I lived. People like us still live there. There was a nuclear war between them. Everything burnt down. Only some of them survived. They built shelters and created new weapons. All materials changed. Martians mostly breathe carbon dioxide.
More problems here. If martian atmosphere was CO(2) during that war, how could anything burn? Flame is a process of oxidation, and oxygen must be a poison for a CO(2)-breathing being. Then he says "They built shelters and created new weapons" - why did they create new weapons if old ones were pretty successful in wiping them out? And it would be nice if he explains how one could extract energy out of CO(2) - unless Martians are plants, and the energy comes from the sunlight.
He says that the planet is inhabited now too, although it lost its atmosphere after a mammoth catastrophe.
Mammoth catastrophe? What's that? Did that catastrophe reduce the gravity on the planet? Gravity is what's holding the atmosphere. But a dreaming child is not likely to know that little detail, of course.
As he was talking, his mother noticed that Lemurians lived 70,000 years ago and they were nine meters tall.
And they were living on a continent that never was. Curiously, nobody was able to find bones of 9-meter tall beings, and those would be hard to miss because of the size and because 70,000 years ago is just like yesterday, as far as fossils are concerned. Trilobites died out 250 *million* years ago, but I can go to a field and pick a few shells myself.
I was just reading that to my family the other night. I got so tickled I could barely get whole sentences out.
And then I skipped to a section of "Roughing It" and hurt myself again!
Twain was amazing.