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Naledi (isbre)

Naledier er lagdelte masser av frosset vann. Lagene oppstår fordi det første islaget gjør at nytt tilstrømmende vann (fra isbre eller elv) ikke lenger har plass nok til å flyte under isen og tar i stedet veien over og rundt islaget. Når det er kaldt nok vil dette vannet selv fryse og danne et nytt lag. Så gjentar historien seg.

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