| Nashville, Tennessee Nashville is the capital of the U.S. state of Tennessee and the county seat of Davidson County. It is the second most populous city in the state after Memphis. It is located on the Cumberland River in Davidson County, in the north-central part of the state. Nashville,_Tennessee
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| Ohio Ohio
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| October 24 October_24
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| Ohio River The Ohio River is the largest tributary, by volume, of the Mississippi River. It is approximately 981United States. Ohio_River
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| Oklahoma Oklahoma
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| Orbit In physics, an orbit is the gravitationally curved path of one object around a point or another body, for example the gravitational orbit of a planet around a star. Orbit
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| Ozone layer ozone layer is a layer in Earth's atmosphere which contains relatively high concentrations of ozone (O3). This layer absorbs 93-99% of the sun's high frequency ultraviolet light, which is potentially damaging to life on earth. Over 91% of the ozone in Earth's atmosphere is present here. Ozone_layer
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| Puerto Rico Puerto Rico ( or Puerto_Rico
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| Pacific Ocean The Pacific Ocean is the largest of the Earth's oceanic divisions. Its name is derived from the Latin name Mare Pacificum, "sea", bestowed upon it by the Portuguese explorer Ferdinand Magellan. It extends from the Arctic in the north to Antarctica in the south, bounded by Asia and Australia in the west, and the Americas in the east. Pacific_Ocean
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| Pound (mass) The pound or pound-mass (abbreviationlb, lbm, or sometimes in the United States#) is a unit of mass imperial, United States customary and other systems of measurement. A number of different definitions have been used, the most common today being the international avoirdupois pound of exactly The word pound comes from the Latin word pondus meaning "weight". The abbreviation lb comes from the Latin word libra, meaning "scales, balances", Pound_(mass)
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| Pennsylvania Pennsylvania
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| History of the Philippines The History of the Philippines is believed to have begun with the arrival of the first humans via land bridges at least 30,000 years ago. The first recorded visit from the West is the arrival of Ferdinand Magellan on Homonhon Island, southeast of Samar on March 16, 1521. History_of_the_Philippines
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| Gasoline Gasoline or petrol is a petroleum-derived liquid mixture, primarily used as fuel in internal combustion engines. It also is used as a powerful solvent much like acetone. Gasoline
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| Puget Sound Puget Sound () is a sound or complex of inland marine waterways in the northwestern part of Washington, United States, extending from the eastern end of the Strait of Juan de Fuca south to the head of the sound at the state capital of Olympia. It branches out from Admiralty Inlet and Deception Pass in the north to Olympia, Washington in the south. The term is also used to mean the general region of the sound, including the Seattle metropolitan area, home to about 4.2 million people. Puget_Sound
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| Panama Canal Panama Canal is a ship canal which joins the Caribbean Sea to the Pacific ocean. One of the largest and most difficult engineering projects ever undertaken, it had an enormous impact on shipping between the two oceans, replacing the long and treacherous route via the Drake Passage and Cape Horn at the southernmost tip of South America. A ship sailing from New York to San Francisco via the canal travels 9,500Cape Horn. French leadership. After this attempt failed and 21,900 workers died, the project Panama_Canal
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| Plankton Plankton consist of any drifting organisms (animals, plants, archaea, or bacteria) that inhabit the pelagic zone of oceans, seas, or bodies of fresh water. Plankton are defined by their ecological niche rather than their phylogenetic or taxonomic classification. They provide a crucial source of food to more familiar aquatic organisms such as fish. Plankton
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| Rhode Island Rhode_Island
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| Red tide Red tide is a common name for a phenomenon more correctly known as an algal bloom, an event in which estuarine, marine, or fresh water algae accumulate rapidly in the water column. These algae, more specifically phytoplankton, are single-celled protists, plant-like organisms that can form dense, visible patches near the water's surface. Certain species of phytoplankton contain photosynthetic pigments that vary in colour from green to brown to red. Red_tide
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| South Dakota South_Dakota
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| San Francisco Bay San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean. Technically, both rivers flow into Suisun Bay, which flows through the Carquinez Strait to meet with the Napa River at the entrance to San Pablo Bay, which connects at its south end to San Francisco Bay, although the entire group of interconnected bays are often referred to as "San Francisco Bay." San_Francisco_Bay
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| Salinity Salinity is the saltiness or dissolved salt content of a body of water. It is a general term used to describe the levels of different salts such as sodium chloride, magnesium and calcium sulfates and bicarbonates. Salinity in Australian English and North American English may also refer to the salt content of soil (see soil salination). Salinity
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| Spratly Islands The Spratly Islands are a group of more than 650 reefs, Spratly_Islands
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| Sunspot sunspot is an area on the Sun's surface (photosphere) that is marked by intense magnetic activity, which inhibits convection, forming areas of reduced surface temperature. They can be visible from Earth without the aid of a telescope. Although they are at temperatures of roughly 4,000–4,500K, the contrast with the surrounding material at about 5,800black body (closely approximated by the photosphere) is a function of Telectric arc. Sunspot
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| St. Louis, Missouri St._Louis,_Missouri
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| Sydney Talk:Sydney
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| South Carolina South_Carolina
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| Sunlight Sunlight, in the broad sense, is the total spectrum of the electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the atmosphere, and the solar radiation is obvious as daylight when the Sun is above the horizon. Near the poles in summer, the days are longer and the nights are shorter or non-existent. Sunlight
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| Sears Tower Sears_Tower
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| Space Shuttle NASA's Space Shuttle, officially called the Space Transportation System (STS), is the spacecraft currently used by the United States government for its human spaceflight missions and is scheduled to be retired from service in 2010. At launch, it consists of a rust-colored external tank (ET), two white, slender Solid Rocket Boosters (SRBs), and the orbiter, a winged spaceplane which is the space shuttle in the narrowest sense. Space_Shuttle
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| Snow Talk:Snow
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| Syracuse, New York Syracuse (locally , generally Syracuse,_New_York
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| Amsterdam Airport Schiphol Amsterdam Airport Schiphol is the Netherlands' main airport, located 20 minutes ( Amsterdam_Airport_Schiphol
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| Ship transport Ship transport refers to the use of watercraft to carry people, generally referred to as passengers, and goods, generally referred to as cargo, from one place to another. Ship_transport
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| Sonar Sonar (originally an acronym for sound navigation and ranging) is a technique that uses sound propagation (usually underwater) to navigate, communicate with or detect other vessels. There are two kinds of sonaracoustic location and of measurement of the echo characteristics of "targets" in the water. Sonar
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| Sacramento, California Sacramento is the capital of the U.S. state of California, and the county seat of Sacramento County. Located along the Sacramento River and just south of the American River's confluence in California's expansive Central Valley, it is the seventh-largest city in California. Sacramento,_California
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| Texas Texas
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| Tennessee Tennessee
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| Tide Tide
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| Toledo, Ohio This article is about the city in Ohio, USA. For Toledo, Spain, see that article. For other uses, see Toledo (disambiguation).Toledo is a city in the U.S. state of Ohio and the county seat of Lucas County. Named after Toledo, Spain, it is located on the western end of Lake Erie, on the Michigan border. Toledo,_Ohio
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| Tsunami Tsunami
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| Utah Utah
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| Urban heat island An urban heat island (UHI) is a metropolitan area which is significantly warmer than its surrounding rural areas. The temperature difference usually is larger at night than during the day and larger in winter than in summer, and is most apparent when winds are weak. Urban_heat_island
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| United States customary units The United States customary system of units of measurement (also called the English, Imperial or American) is the most commonly used system of measurement in the United States. The US is the only industrialized nation that does not mainly use the metric system in its commercial and standards activities, although there is increasing use of the International System of Units (SI, usually referred to as "metric" in the U.S.) United_States_customary_units
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| Virginia Virginia
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| Virginia Talk:Virginia
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| Vermont Vermont
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| Wake Island Wake Island (also known as Wake Atoll, ) is a coral atoll having a coastline of 12 miles (19 kilometers) in the North Pacific Ocean, located about two-thirds of the way from Honolulu (2,300 statute miles or 3,700 km west) to Guam (1,510 miles or 2,430 km east). Wake_Island
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| Whaling Whaling is the hunting of whales which can be dated as a human activity to at least 6,000 BC. The evolution of traditional Arctic whaling developed with increasing rapidity by early organ International Whaling Commission (IWC) for its consensus-based emphasis on conservation, resource management, and international cooperative standards. Whaling
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| World Meteorological Organization The World Meteorological Organization (WMO) is an intergovernmental organization with a membership of 188 Member States and Territories. It originated from the International Meteorological Organization (IMO), which was founded in 1873. Established in 1950, WMO became the specialised agency of the United Nations for meteorology (weather and climate), operational hydrology and related geophysical sciences. World_Meteorological_Organization
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| Washington Dulles International Airport Washington Dulles International Airport is a public airport located 25 miles (40central business district of Washington, D.C., in Dulles, Virginia (Loudoun County and Fairfax County, Virginia, United States). Washington_Dulles_International_Airport
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