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Mountain - Wikipedia
英語「mountain」の意味・使い方・読み方 | Weblio英和辞書
Mountains Information and Facts | National Geographic
Mountain | Definition, Characteristics, Types, & Facts | Britannica
15 Iconic Japanese Mountains You Must Visit
MOUNTAIN | 意味, Cambridge 英語辞書での定義
Mountain - Simple English Wikipedia, the free encyclopedia
Physical features and formation of mountains | Britannica
How do mountains form? | Live Science
Mountain Habitat - National Geographic Kids