2007-09-01 07:20:13 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
I believe it is a fault line or discontinuity in the surface, where one area has dropped down or raised up relative to the rest. There in an excellent book that discusses everything you ever wanted to know about the Moon, including graben. I'll look it up for you on amazon.com and get back to you.
OK, I'm back. It's "The Once and Future Moon" by Paul Spudis. It will tell you basically everything there is to know about the Moon, including graben, in easy to read laymen's terms. I loved it.
2007-09-01 09:04:33 · answer #1 · answered by Sciencenut 7 · 1⤊ 0⤋
it's is a fault line or discontinuity in the surface, where one area hassort of a valley . like the grand canyon seen from space .
2007-09-01 09:42:56 · answer #2 · answered by Anonymous · 1⤊ 0⤋