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The word is derived from the Arabic word ʿirq (عرق), meaning "dune field". [2] Strictly speaking, an erg is defined as a desert area that contains more than 125 km 2 (48 sq mi) of aeolian or wind-blown sand [3] and where sand covers more than 20% of the surface. [2] Smaller areas are known as "dune fields". [4]
Also in 2014, Yelp expanded in Europe through the acquisitions of German-based restaurant review site Restaurant-Kritik and French-based CityVox. [65] [66] [67] In early February 2015, Yelp announced it bought Eat24, an online food-ordering service, for $134 million. [68] [69] [70] Then in August 2017, Yelp sold Eat24 to Grubhub for $287.5 million.
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A large dune complex is called a dune field, [7] while broad, flat regions covered with wind-swept sand or dunes, with little or no vegetation, are called ergs or sand seas. [ 8 ] [ 9 ] [ 10 ] Dunes occur in different shapes and sizes, but most kinds of dunes are longer on the stoss (upflow) side, where the sand is pushed up the dune, and have ...
The Algodones Dunes is a large sand dune field, or erg, located in the southeastern portion of the U.S. state of California, near the border with Arizona and the Mexican state of Baja California. The field is approximately 45 miles (72 km) long by 6 miles (9.7 km) wide and extends along a northwest-southeast line that correlates to the ...
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The Great Sand Sea stretches about 650 km (400 mi) from north to south and 300 km (190 mi) from east to west. On satellite images, this desert shows a pattern of long sand ridges running in a roughly north-south direction. However, despite the apparent uniformity, the Great Sand Sea has two large areas with different types of megadunes. [1]