Post by baehron on Jun 21, 2010 11:30:48 GMT -5
On National Geographic channel last night, a new,4 part series called 'How the Earth changed History' began airing. 2nd part, about the Earth's crust showed a cavern in Mexico with gypsum crystals traversing entire cave, some seemingly 15 to twenty feet long. Quite a view.
Kenn
Kenn