por marjorievelasco | Sep 28, 2025 | Uncategorized
In 1818, John Cleves Symmes, Jr. advised that the Earth consisted of a hollow shell about 1,300 km (810 mi) thick, with openings about 2,300 km (1,four hundred mi) throughout at each poles with 4 inside shells every open at the poles. Symmes became probably the most...