amounts of it and forcing seas of lava through cracks in the surface Apollo 15 found a rockslide in the crater collapse key six times greater than any rockslide on earth Apollo 16 discovered that the collision that created the sea of nectar deposited debris as much as 1,000 miles away Apollo 17 landed near a scarp eight times higher than any on earth meaning it was formed by a moonquake eight times more violent than any earthquake in history the convulsions following that cosmic event continued for some 800 million years so that the