crater where you're trying to get as much as possible in a close area. Yeah there's some of that so we balance two major things the geology which tells you like was there a river there that carved the canyon whether you know a faults or whatever and then the mineral which could tell you if a lake was there and like on earth a lake disappears at leaves salt flats behind so we see that on Mars now for more so the gold mine the the perfect site on Mars we have all this geologic evidence