U.S. participation in NATO was a break with tradition, since the United States for the first time set itself up to automatically get involved in foreign conflicts--something that was very unnerving for a country of people who for most of American's history had been very isolationist.
These areas are named triple junctions and can be found in several places across the world today. The separated margins of the continents evolve to form passive margins. Hess' theory was that new seafloor is formed when magma is forced upward toward the surface at a mid-ocean ridge.
Answer:Obsidian was volcanic glass in a ring of volcanoes along the Pacific coast of the Maya area. Mayan technicians made techniques for cutting sharp blades. As said, Mayans used specialized jade tools that helped their technological achievements. Maya is thought to be the first civil engineers of the Americas.
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