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浮石

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Kutkhiny Baty, a pumice rock formation outcrop located 4 km from the source of the Ozyornaya River (Lake Kurile), near the southern tip of the Kamchatka Peninsula, Russia

軽石（パミス）の科学形成メカニズムから多様な活用法まで

軽石火山岩火山ガラス多孔質
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