not in the dry desert climate that prevails today." However, the organism that caused these structures remains a mystery. Top view of an outcrop in Namibia showing the marble penetrated by a group ...

From Grand Canyon Village, visitors can head east along Desert View Drive for 23 miles to find six developed canyon viewpoints, four picnic areas and five pullouts. Perched along the canyon's rim ...

In November, workers in the northwest autonomous region of Xinjiang completed a roughly 2,000-mile "green belt" around the Taklimakan Desert ... square miles of trees have been planted, according ...