![Rocky inscription, Mongolian Altai](/show/photo/21703/g150.jpg)
Rocky inscription, Mongolian Altai
© Hanžl, Pavel | 2006
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![Siltstone dune, Mongolian Altai](/show/photo/21699/g150.jpg)
Siltstone dune, Mongolian Altai
© Hanžl, Pavel | 2012
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![Black sands, Kos island, Aegean see](/show/photo/21700/g150.jpg)
Black sands, Kos island, Aegean see
© Hanžl, Pavel | 2012
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![Permian rhyolite, Mongolian Altai](/show/photo/21705/g150.jpg)
Permian rhyolite, Mongolian Altai
© Hanžl, Pavel | 2012
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![Mofettes, Stefanos crater, Nisyros, Aegean see](/show/photo/21706/g150.jpg)
Mofettes, Stefanos crater, Nisyros, Aegean see
© Hanžl, Pavel | 2012
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