From the rolling prairie of Flint Hills, Kansas, to New Zealand's Fiordland National Park, nature's mesmerizing beauty reminds us why our Earth is worth protecting. See some of our planet's best in this Green Earth gallery.
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Discs of travertine ring a 12-foot-wide (3.7-meter-wide) hot spring in Ethiopia's Danakil Depression. Also called the Afar Depression, this area is a tectonic triple junction where the spreading mid-ocean ridges forming the Red Sea and the Gulf of Aden emerge on land and meet the East African Rift. Travertine is a volcanically heated, calcium-rich flow from hot springs.
Photograph by Carsten Peter
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