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Aerial Directly above view of the Opal mines of Coober Pedy, South Australia.

Rainbow Mountain, Peru. Also known as Cerro Colorado near to Cusco. Aerial view. South America

$Nearly a thousand years ago natives inhabited the plains between the Painted Desert and the San Francisco Peaks of Arizona. In an area so dry it would seem impossible to live, they built pueblos, harvested rainwater, grew crops and raised families. Today the remnants of their villages dot the landscape. Wukoki, a modern Hopi word for \$

Impressive Meteor Crater, Barringer Crater, Arizona, USA. A geological landmark formed by a meteorite impact 50,000 years ago. Arid desert terrain, steep walls, sparse vegetation.

$Wet rough asphalt black bitumen road pavement surface abstract grunge texture close-up top view background banner.\nBitumen is a sticky, black, highly viscous liquid or semi-solid form of petroleum. In the U.S., it is commonly referred to as asphalt. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used.\nTarmacadam is a road surfacing material made by combining crushed stone, sand, and tar. It is a more durable and dust-free enhancement of simple compacted stone macadam surfaces. The terms \$