Submission + - Journey to the Mantle of the Earth? (newscientist.com) 1
Doofus writes: New Scientist has an interesting story about a Japanese effort to reach the Earth's mantle. While some mantle material has been recovered from volcanoes, no pure mantle material has been obtained. (We have moon rocks, but nothing from a few km beneath our feet!) Accompanying the article is a gallery of previous attempts at drilling farther and farther into the Earth's crust.