7 Geological Wonders from the World's 7 Continents
Known as Karlu Karlu to Australia’s aboriginal people and one of their most sacred sites, The Devil’s Marbles are huge blocks of 1.7 billion year old granite rounded by countless centuries of weathering. Wind, water, temperature and sunlight conspire to erode and, on occasion, split the massive ovoids which sit, individually or in groups, in a desolate Outback valley.
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