vulcanii pe terra: activi si inactivi
DESCRIPTION
Vulcanii pe Terra: activi si inactivi. Vulcan activ = vulcan care a erupe cu regularitate sau a erupt in decursul ultimilor 10.000 de ani *cel putin 20 de vulcani vor erupe in timp ce cititi aceste randuri(de ex. Vulcanul Stromboli erupe de mai mult de 100 de ani) - PowerPoint PPT PresentationTRANSCRIPT
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Vulcanii pe Terra:
activi si inactivi
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Vulcan activ = vulcan care a erupe cu regularitate sau a erupt in
decursul ultimilor 10.000 de ani
*cel putin 20 de vulcani vor erupe in timp ce cititi aceste randuri(de ex. Vulcanul Stromboli erupe de mai mult de 100 de ani)*in medie,60 de vulcani au erupt in fiecare an in perioada anilor 90’*550 de vulcani au avut eruptii atestate istoric*aproape 1500 au erupt in ultimii 10.000 ani*numarul vulcanilor tineri subacvatici se apropie de 1 milion
Numarul total al vulcanilor de pe Terra este necunoscut
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1. http://www.iris.edu/seismon/
2.http://www.volcanodiscovery.com/erupting_volcanoes.html
3.http://www.geo.mtu.edu/volcanoes/world.html
Vulcani activi
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Raspandirea vulcanilor si a cutremurelor de pamant pe glob coincide cu cea a marilor fracturi ale scoartei- rifturile si fosele. Cele mai importante sunt:
a) Zonele de rifturi din oceanele Atlantic si Indian din estul Africii
b) Zonele de subductie precum Japonia, Filipine si vestul Americilor( toate facand parte din asa numitul “cerc de foc al Pacificului”)
c) Zonele corespunzatoare lanturilor de munti tineri ( vulcanii Etna si Vezuviu din Italia, lantul muntos din Romania)
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vulcanul Chaiten, din Chile
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Muntele Cleveland, din Alaska
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Etna, situat in estul Siciliei
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vulcanul Manam, din Papua Noua Guinee
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Vulcanul Klyuchevskaya ,Rusia
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Rusia
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Kilimanjaro din Tanzania
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Vulcanii subacvatici
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Vulcani stinsi
• Daca un vulcan nu a erupt in ultimii 10.000 ani,il numim vulcan adormit.
• Daca nu a erupt de peste 25.000 ani,se poate considera stins.
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Vulcani care au erupt pe Terra de-a lungul timpului:
http://www.volcano.si.edu/world/find_eruptions.cfm
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Vulcani in timp real:
http://www.volcanolive.com/volcanocams.html