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The Ogallala Aquifer (oh-gə-LAH-lə) is a shallow water table aquifer surrounded by sand, silt, clay, and gravel located beneath the Great Plains in the United States. As one of the world's largest aquifers, it underlies an area of approximately 174,000 sq mi (450,000 km 2) in portions of eight states (South Dakota, Nebraska, Wyoming, Colorado, Kansas, Oklahoma, New Mexico, and Texas). [1]
Water pollution in the United States is a growing problem that became critical in the 19th century with the development of mechanized agriculture, mining, and industry, although laws and regulations introduced in the late 20th century have improved water quality in many water bodies. [ 1] Extensive industrialization and rapid urban growth ...
The 1991 Halloween blizzard was a powerful storm that caused a period of heavy snowfall and ice accumulation, which affected parts of the Upper Midwest of the United States, from October 31 to November 4, 1991. Over the last week of October 1991, a large storm system over the Atlantic Ocean ( 1991 Perfect Storm) blocked most of the weather ...
The modern holiday of Halloween traces its origins back to Samhain, an ancient Pagan festival that marked the end of summer and the harvest season and the beginning of the long winter, according ...
The inland and intracoastal waterways of the eastern United States. The inland waterways of the United States include more than 25,000 mi (40,000 km) of navigable waters. Much of the commercially important waterways of the United States consist of the Mississippi River System —the Mississippi River and connecting waterways.
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Halloween is a celebration observed on October 31, the day before the feast of All Hallows, also known as Hallowmas or All Saint's Day. The celebrations and observances of this day occur primarily in regions of the Western world, albeit with some traditions varying significantly between geographical areas.
Trick-or-treating season is here! And that means America is stocking up on Halloween candy. This 2023 map shows which candies are most popular in every state.