compound dune

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Diverse elementary school children wearing school uniforms running outside of school. Boys girls

Pro and Con: School Uniforms

Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint

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Los Angeles Police Department wanted flyer on Elizabeth Short, aka the "Black Dahlia," who was brutally murdered in January 1947. The FBI supported the Los Angeles Police Department in the case, including by identifying Short through her fingerprints that

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Mayer Amschel Rothschild (1744-1855), founder of the house of Rothschild; lithograph by Friedrich Lieder, c. 1830.

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A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000

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Woman tied to a ducking stool, a method of punishment by means of humiliation, beating, or death. (cucking stool)

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Santa Claus flying in his sleigh, christmas, reindeer

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compound dune

geology

Also known as: draa, mega-dune

Learn about this topic in these articles:

formation and growth

In sand dune: Dune and sheet patterns
…very large dunes known as compound dunes, mega-dunes, or draa. These are sometimes arranged parallel to the apparent flow, in long ridges, and occasionally transverse to it in great sand waves. The compound dunes are usually covered with a smaller, secondary dune pattern, and the smaller dunes with ordinary sand…
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physiography of Sahara

In Sahara: Physiography
…of nearly 500 feet, while draa, the mountainous sand ridges that dominate the ergs, are said to reach 1,000 feet. An unusual phenomenon associated with desert sands is their “singing” or booming. Various hypotheses have been advanced to explain the phenomenon, such as those based upon the piezoelectric property of…
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