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RBF Definitions
in North America’s Mexican mountains. "In the northern hemisphere, the northern ends of these three southern-hemisphere-emanating ridges are interconnected by fourth, fifth, and sixth ridges, respectively. The fourth consists of the Alps, Asia Minor’s highlands and islands, and the Himalayas. This fourth ridge runs between Europe and Indo-China and interconnects the northern terminals of ridges one and two. The fifth ridge consists of the China-Kamchatka mountains, and the Aleutian and North America’s Rockies, which joins the northern end of ridge two with the northern end of ridge three in Mexico. The sixth ridge runs from Mexico and the terminals of ridges three and five via El Paso, Texas, and is thereafter momentarily broken through by the Mississippi; it continues as the Ozarks and the Appalachians and reaches northeastward as a chain via Newfoundland, Labrador, Greenland, Iceland, British Isles, Scandinavia, and Urals to final juncture with ridges one and four at the Alps. “These six main ridges have for long been seen by physical geologists and geographers to constitute the now distorted–sunken here and risen there-- six edges of a spherical tetrahedron.” - Cite BEAR ISLAND STORY, galley p.7, 1968
