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Although the United States has many sites with contaminated soils, it has been a leader in defining and implementing standards for cleanup. [4] Each year, thousands of sites complete soil contamination cleanup, some by using microbes that “eat up” toxic chemicals in soil, [5] many others by simple excavation and others by soil vapor extraction, air stripping, or solvent extraction, with ...
Dirt track racing is the single most common form of auto racing in the United States. According to the National Speedway Directory, there are over 700 dirt oval tracks in operation in the US. [1] The composition of the dirt on tracks has an effect on the amount of grip available. Many tracks use clay with a specific mixture of dirt.
Lynch Quarry Site, North Dakota, NRHP-listed and a U.S. National Historic Landmark, a flint quarry that was "a major source of flint found at archaeological sites across North America, and it has been estimated that the material was mined there from 11,000 B.C. to A.D. 1600."
A season of artworks and exhibits on the theme of dirt was sponsored by the Wellcome Trust in 2011. The centrepiece was an exhibition at the Wellcome Collection showing pictures and histories of notable dirt such as the great dust heaps at Euston and King's Cross in the 19th century and the Fresh Kills landfill which was once the world's largest landfill.
The 1913 motorcycle championship races were moved to a dirt track because dirt was safer. [30] The national organization overseeing motorcycle racing banned all competitions on board tracks shorter than 1-mile (1.6 km) in 1919. [31] One by one, the manufacturers withdrew their support due to the negative publicity. [27]
Workers assigned to clean up a pile of dirt at an 800-year-old temple in Cambodia quickly found their task was anything but straightforward. Instead, the project uncovered dozens of ancient statues.
The alignments are still partially used today, for instance, parts of England's A1. Before the 13th century, there were no organized networks of streets inside cities, merely shifting footpaths. With the invention of the horse harness and wagons with swivelled front axles that could make tight turns, urban street networks stabilized. [15]
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