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Mountain | Definition, Characteristics, Types, & Facts
Mountain states - Wikipedia
List of mountain ranges - Wikipedia
Mountains Information and Facts | National Geographic
Mountain States - WorldAtlas
Rocky Mountains | Location, Map, History, & Facts | Britannica
Highland - Wikipedia
Mountain ecosystem | Ecology, Flora & Fauna | Britannica
The World's 10 Most Mountainous Countries - WorldAtlas
North America: Physical Geography - National Geographic Society