Oparara limestone reflections
Ripple marks
Snowy twigs
Painted Cliffs
Glebionis carinatum
Holopneustes
Algal globules
Sand sculpture
Ochrolechia parella
Sand ripples
Oparara limestone reflectionsLimestone reflections in the Oparara River, Kahurangi National Park, West Coast, New Zealand. The Oparara River carves its way through the limestone deposits of the Oparara Valley. Tannins, released from rotting vegetation, color its waters red or golden brown.
Ripple marksRipple marks in geothermal clay at the bottom of a stream, southwest Iceland.
Snowy twigsA tangle of snow-covered spruce twigs, southwest Iceland.
Painted CliffsSandstone patterns in the Painted Cliffs, Maria Island, Tasmania. The Painted Cliffs on Maria Island are renowned for their patterned, Triassic sandstone. The patterns were formed when iron-rich ground water leached through the bedrock.
Glebionis carinatum<b>Tricolor daisy</b> (<i>Glebionis carinatum</i>), close-up of flowers.
HolopneustesSea urchin shell detail (<i>Holopneustes sp.</i>), New South Wales, Australia.
Algal globulesDetail of a floating mat of blue-green algae in a hot spring, Grændalur, southwest Iceland.
Sand sculptureWind-sculpted sand, Farewell Spit, South Island, New Zealand.
Ochrolechia parella<b>Crab's eye lichen</b> (<i>Ochrolechia parella </i>), southwest Iceland.
Sand ripplesRipple marks in sand, Farewell Spit, South Island, New Zealand. Ripple marks form when wind blows over loose sand. It causes the sand grains to drift along the surface and they organize themselves into ridges and depressions that move slowly in the direction of the wind. A similar process often occurs when water flows over a sandy bottom.
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