| Alaska | HighestElev = 6,193.7 Alaska
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| Atlantic Ocean The Atlantic Ocean is the second-largest of the world's oceanic divisions; with a total area of about 106.4 million square kilometres (41. Atlantic_Ocean
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| Aromatic hydrocarbon An aromatic hydrocarbon (abbreviated as AH) or arene Definition IUPAC Gold Book Link is a hydrocarbon, of which the molecular structure incorporates one or more planar sets of six carbon atoms that are connected by delocalised electrons numbering the same as if they consisted of alternating single and double covalent bonds. The term 'aromatic' was assigned before the physical mechanism determining aromaticity was discovered, and was derived from the fact that many of the compounds have a sweet scent. Aromatic_hydrocarbon
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| Aleutian Islands |country largest city = Unalaska Aleutian_Islands
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| Aquaculture Aquaculture is the farming of freshwater and saltwater organisms including molluscs, crustaceans and aquatic plants. Unlike fishing, aquaculture, also known as aquafarming, implies the cultivation of aquatic populations under controlled conditions. Aquaculture
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| Ambergris Ambergris (Ambra grisea, Ambre gris, ambergrease, or grey amber) is a solid, waxy, flammable substance of a dull gray or blackish color produced in the digestive system of sperm whales. Ambergris
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| Acre The acre is a unit of area in a number of different systems, including the imperial and U.S. Acre
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| Arkansas |HighestElev = 840 Arkansas
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| Arizona |HighestElev = 3,851 Arizona
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| Austin, Texas The ATX, City of the Violet Crown Austin,_Texas
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| Autumn Autumn (also known as fall in North American English) is one of the four temperate seasons. Autumn marks the transition from summer into winter, usually in late September (northern hemisphere) or late March (southern hemisphere) when the arrival of night becomes noticeably later. Autumn
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| Acid rain Acid rain is rain or any other form of precipitation that is unusually acidic. It has harmful effects on plants, aquatic animals, and infastructure. Acid_rain
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| Buffalo, New York Buffalo (The city's name is pronounced by a minority of local residents), is the second largest city in New York State. Located in Western New York on the eastern shores of Lake Erie and at the head of the Niagara River, Buffalo is the principal city of the Buffalo-Niagara Falls metropolitan area and the [[county se Buffalo,_New_York
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| Benjamin Franklin |birth_place=Boston, Massachusetts Benjamin_Franklin
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| Boston, Massachusetts The Hub (of the Universe),1 The Cradle of Liberty, Title Town, The Cradle of Modern America, Athens of America, The Walking City Boston,_Massachusetts
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| Blue Whale | status = EN Blue_Whale
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| Coast The coast is defined as the part of the land adjoining or near the ocean. A coastline is properly a line on a map indicating the disposition of a coast, but the word is often used to refer to the coast itself. Coast
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| Conversion of units Conversion of units refers to conversion factors between different units of measurement for the same quantity. Conversion_of_units
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| Colorado Colorado
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| Columbia River The Columbia River (known as Wimahl or Big River to the Chinook-speaking natives who live on its lowermost reaches) is the largest river in the Pacific Northwest region of North America. It is named after the Columbia Rediviva, the first ship from the western world known to have traveled up the river. Columbia_River
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| Cameroon |conventional_long_name = Republic of Cameroon Cameroon
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| Geography of Cameroon At 183,568 mi² (475,440 km²), Cameroon is the world's 53rd-largest country. It is comparable in size to Papua New Guinea, and somewhat larger than the U. Geography_of_Cameroon
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| Geography of Colombia The geography of Colombia is characterized by containing five main natural regions that present their own unique characteristics, from the Andes mountain range region shared with Ecuador and Venezuela; the Pacific Ocean coastal region shared with Panama and Ecuador; the Caribbean Sea coastal region shared with Venezuela and Panama; the Llanos (plains) shared with Venezuela; to the Amazon Rainforest region shared with Venezuela, Brazil, Peru and Ecuador. Colombia is one of only two South American countries which border both the Atlantic and Pacific Oceans. Geography_of_Colombia
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| Carbon dioxide | Section2 = Carbon_dioxide
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| Columbus, Ohio |population_total = 747755 (15th]) Columbus,_Ohio
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| Cleveland, Ohio |title=Geographic Names Information System Feature Detail Report|accessdate=2007-03-27|publisher=USGS }} Cleveland,_Ohio
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| Carbon sink A carbon sink is reservoir of carbon that accumulates and stores carbon for an indefinite period. The main natural sinks are: Carbon_sink
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| Climate Climate encompasses the temperatures, humidity, rainfall, atmospheric particle count and numerous other meteorogical factors in a given region over long periods of time, as opposed to the term weather, which refers to current activity. The climate of a location is affected by its latitude, terrain, altitude, persistent ice or snow cover, as well as nearby oceans and their currents. Climate
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| Connecticut Note: The peak of Mount Frissellis in Massachusetts | Connecticut
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| Cat | status = DOM Cat
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| Chicago (), Make No Small Plans, I Will Chicago
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| London Borough of Croydon The London Borough of Croydon () is a London borough in South London, England and is part of Outer London. It covers an area of and is the largest London borough by population. London_Borough_of_Croydon
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| Caribbean Sea For the region, see Caribbean. Caribbean_Sea
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| Decibel The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit. Decibel
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| Denver, Colorado |subdivision_type1 = State Denver,_Colorado
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| Davenport, Iowa Davenport is a city along the Mississippi River in the American state of Iowa. As of the 2000 census, the city had a population of 98,359 and an area of 64. Davenport,_Iowa
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| Detroit, Michigan |2 =•JoAnn Watson Detroit,_Michigan
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| Dolphin Dolphins are marine mammals that are closely related to whales and porpoises. There are almost forty species of dolphin in seventeen genera. Dolphin
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| Earth | caption = Famous "Blue Marble" photograph of Earth, taken from Apollo 17 Earth
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| English words with uncommon properties For the purposes of this article, any word which has appeared in a recognised general English dictionary published in the 20th century or later is considered a candidate. For interest, some archaic words, non-standard words and proper names are also included. English_words_with_uncommon_properties
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| Eugene, Oregon |timezone = PST Eugene,_Oregon
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| Ecosystem An ecosystem is a natural unit consisting of all plants, animals and micro-organisms(biotic factors) in an area functioning together with all of the non-living physical (abiotic) factors of the environment.Christopherson, RW (1996) Geosystems: An Introduction to Physical Geography. Ecosystem
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| Eclipse An eclipse is an astronomical event that occurs when one celestial object moves into the shadow of another. The term is derived from the ancient Greek noun (), from verb (), "I cease to exist," a combination of prefix (), from preposition (), "out," and of verb (), "I am absent". Eclipse
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| Exxon Valdez oil spill The Exxon Valdez oil spill occurred in Prince William Sound, Alaska, on March 24, 1989. It is considered one of the most devastating man-made environmental disasters ever to occur at sea. Exxon_Valdez_oil_spill
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| El Niño-Southern Oscillation El Niño-Southern Oscillation (ENSO; commonly referred to as simply El Niño) is a global coupled ocean-atmosphere phenomenon. The Pacific ocean signatures, El Niño and La Niña are important temperature fluctuations in surface waters of the tropical Eastern Pacific Ocean. El_Niño-Southern_Oscillation
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| Fort Wayne, Indiana United States Fort_Wayne,_Indiana
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| Fur seal Fur seals are any of nine species of pinnipeds in the Otariidae family. One species, the northern fur seal (Callorhinus ursinus) inhabits the North Pacific, while seven species in the Arctocephalus genus are found primarily in the Southern hemisphere. Fur_seal
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| Global Positioning System The Global Positioning System (GPS) is the only fully functional Global Navigation Satellite System (GNSS) in the world. The GPS uses a constellation of between 24 and 32 Medium Earth Orbit satellites that transmit precise microwave signals, that enable GPS receivers to determine their current location, the time, and their velocity (including direction). Global_Positioning_System
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| Greenhouse effect The Greenhouse effect refers to the change in the thermal equilibrium temperature of a planet or moon by the presence of an atmosphere containing gas that absorbs infrared radiation.IPCC AR4 SYR Appendix Glossary Greenhouse gases] warm the atmosphere by efficiently absorbing thermal infrared radiation emitted by the [[Earth| Earth’s surface, by the atmosphere itself, and by clouds. Greenhouse_effect
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| Geodesy Geodesy (OED), also called geodetics, a branch of earth sciences, is the scientific discipline that deals with the measurement and representation of the Earth, including its gravitational field, in a three-dimensional time-varying space. Geodesists also study geodynamical phenomena such as crustal motion, tides, and polar motion. Geodesy
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