How many active volcanoes are in the U.S. and where are they located?
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STATE & NUMBER OF\nACTIVE VOLCANOES\nWashington 7\nOregon 20\nCalifornia 19\nIdaho 4\nNevada 1\nWyoming 1\nUtah 4\nArizona 2\nNew Mexico 3\nColorado 1\nAlaska 90\nHawaii 10
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It's a volcano in Skamania County, Washington, United States. It is part of the Cascade range and is located 96 miles south of Seattle, WA and 53 miles northeast of Portland, Oregon.  \n\nIt erupted May 18, 1980, killing 57 people and destroying 250 homes, 47 bridges, 15 miles of railway, and 185 miles of highway.
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http://en.wikipedia.org/wiki/Volcanos
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Volcanic activity can be classified as \na)active b)intermittent c)dormant or d)extinct. \n\nActive volcanoes erupt constantly. The eruption is generally quiet,but occasionally becomes violent. A famous active volcano is Stromboli,which lies on an island off the coast of Italy.\n\nIntermittent volcanoes erupt at fairly regular periods. Such volcanoes include Mount Asama in Japan, Mount Etna in Sicily, and Hawaii's Hualalai.\n\nDormant volcanoes have become inactive, but not long enough to know whether they will erupt again. Such 'sleeping' volcanoes include Lassen Peak in California and Paricutin in Mexico.\n\nExtinct volcanoes have been inactive since the beginning of recorded history. Aconcagua in Argentina and Mount Kenya in Kenya are extinct volcanoes. They propably will not erupt again.
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Japan, US, Mexico, etc around the Pacific Ocean.  Subject to a lot of earthquakes and volcanoes (caused by the same thing)
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Curiously, I could not find a comprehensive listing.  This site might be helpful, however, or at least give you a start.\n\nhttp://dir.yahoo.com/Science/Earth_Sciences/Geology_and_Geophysics/Volcanology/Volcanoes
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Iam not an American, but I think I am correct in saying that Mount Lassen is still an active  volcano,  it stays quiet for a number of years and then without warning it has a massive expulsion.I do know it is in a National Park and in an area of outstanding beauty.
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Geologists generally group volcanoes into four main kinds--cinder cones, composite volcanoes, shield volcanoes, and lava domes. \n\nIn regard to your question, Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air, it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone. Most cinder cones have a bowl-shaped crater at the summit and rarely rise more than a thousand feet or so above their surroundings. Cinder cones are numerous in western North America as well as throughout other volcanic terrains of the world.\n\nShield volcanoes are built almost entirely of fluid lava flows. Flow after flow pours out in all directions from a central summit vent, or group of vents, building a broad, gently sloping cone of flat, domical shape, with a profile much like that of a warrior's shield. They are built up slowly by the accretion of thousands of highly fluid lava flows called basalt lava that spread widely over great distances, and then cool as thin, gently dipping sheets. Lavas also commonly erupt from vents along fractures (rift zones) that develop on the flanks of the cone. Some of the largest volcanoes in the world are shield volcanoes. In northern California and Oregon, many shield volcanoes have diameters of 3 or 4 miles and heights of 1,500 to 2,000 feet. The Hawaiian Islands are composed of linear chains of these volcanoes including Kilauea and Mauna Loa on the island of Hawaii-- two of the world's most active volcanoes. The floor of the ocean is more than 15,000 feet deep at the bases of the islands. As Mauna Loa, the largest of the shield volcanoes (and also the world's largest active volcano), projects 13,677 feet above sea level, its top is over 28,000 feet above the deep ocean floor.
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It has eight main islands, which are the tops of a chain of submerged volcanic mountains; active volcanoes: Mauna Loa, Kilauea.
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Currently, it is 8,364 feet.\nBefore the 1980 eruption, it was 9,677 feet.\n\nThe source below is from the U.S. Geological Survey's Cascades Volcano Observatory
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Sakurajima, Japan \nSantamaria/Santiaguito, Guatemala \nSantorini, Greece \nTaal Volcano, Philippines \nTeide, Canary Islands, Spain \nUlawun, Papua New Guinea \nMount Unzen, Japan \nVesuvius, Italy \nMerapi, Indonesia \nAvachinsky-Koryaksky, Kamchatka, Russia \nColima, Mexico \nMount Etna, Italy \nGaleras, Colombia \nMauna Loa, Hawaii, USA  \nNyiragongo, Democratic Republic of the Congo \nMount Rainier, Washington, USA
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There are a total of 50 states.  There are the 48 continental states and Alaska and Hawaii.  The United States also has six territories and the District of Columbia.
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The largest volcano crater on earth is the Yellowstone crater.\nhttp://search.yahoo.com/search?p=+Yellowstone+Mega+volcano+crater&prssweb=Search&ei=UTF-8&fr=ytff1-&x=wrt
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A subset of the map at the following web page?\n\nhttp://www.mapsofworld.com/major-volcanoes.htm
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http://www.volcano.si.edu/reports/usgs/index.cfm
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Here you go:\nhttp://www.nps.gov/crla/\nhttp://volcano.und.nodak.edu/vwdocs/volc_images/north_america/crater_lake.html\nhttp://en.wikipedia.org/wiki/Crater_Lake%2C_Oregon
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The "Ring of Fire" is an arc stretching from New Zealand, along the eastern edge of Asia, north across the Aleutian Islands of Alaska, and south along the coast of North and South America. It is composed over 75% of the world's active and dormant volcanoes.