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山窿(粵拼:Saan1 Lung1)係自然形成、喺山裏面嘅中空部份,係一啲嘅好大竉,通常大到可以畀人或者動物入去。好耐以前,原始人會喺度住。書面亦叫穴。
山竉形成方式可能係水嘅侵蝕作用,又或者係風同微生物等其他外力嘅風化作用。好多自然形成嘅山竉係喺石灰岩地帶,稱之為溶洞(鐘乳洞)。
幾乎全世界都可以搵到山竉。
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