They weren't going to get anywhere without trying, there was no further argument there. Although Kaiba hadn't thought the science lecture was necessary it at least further displayed that she had any idea of what she was talking about. That being said he didn't offer up much to the discourse.

"How they were formed wouldn't be in keeping with either set of rocks," Ie this specific cave just appeared at will, whenever it felt like it, presumably. "The test for it should be fairly simple however, so once that's assessed we can go from there."

This..., person, was really enthusiastic about all this. "Not to my knowledge. I haven't seen any evidence that Mt. Silver is volcanic in nature, and it's all we've got for mountains so far. That wouldn't rule out the idea entirely since depending on the stage of development, or location a volcano might not be instantly recognizable." Standing there he gazed down at his notes, before placing them away inside his jacket pocket.