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The country is located in central north America.The capital city Washington DC is situated at 38¡ã53¡äN 77¡ã02¡äW. It shares its border with Canada to the north,Mexico to the south,the state of Alaska to the northwest.The state of Hawaii is an island in the mid-Pacific ocean.USA is the 3rd or 4th largest country according to total area.It is the 3rd..
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A pearl is a hard, rounded object produced by certain animals, primarily mollusks such as oysters. Pearls can be used in jewelry and also crushed in cosmetics or paint. Pearl is valued as a gemstone and is cultivated or harvested for jewelry. Pear ls are formed inside the shell of certain bivalve mollusks. As a response to an irritating parasite inside its shell, the mollusk will deposit layers of calcium carbonate (CaCO3) in the form of the minerals aragonite or calcite (both crystalline forms of calcium carbonate) held together by an organic horn-like compound called conchiolin. This combination of calcium carbonate and conchiolin is called nacre, or as most know it, mother-of-pearl . The idea that a grain of sand acts as a "seed" for the pearl is a myth.[1]
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