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  • Volcano - Wikipedia
    Augustine Volcano (Alaska) during its eruptive phase on January 24, 2006 A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface [1]On Earth, volcanoes are most often found where tectonic plates are diverging or converging, and because most of
  • Which Volcanoes are Erupting? - List map of Active Volcanoes Erupting . . .
    Volcanoes Spices This 17-days adventurous expedition is one of our most exciting volcano tours! Visit Halmahera, North Sulawesi and the Sangihe Islands with some of Indonesia's most active volcanoes, including Dukono, Ibu, Lokon, Soputan and Karangetang
  • About Volcanoes | U. S. Geological Survey - USGS. gov
    Shield volcanoes build up slowly by the growth of thousands of lava flows that spread widely over great distances, and then cool as thin sheets On Earth, some of the most massive volcanoes are shield volcanoes In northern California and Oregon, many shield volcanoes are up to 3 or 4 miles wide and as tall as 1,500 to 2,000 feet
  • Volcano | Definition, Types, Facts | Britannica
    volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases A volcanic eruption is an awesome display of Earth’s power Yet, while eruptions are spectacular to watch, they can cause disastrous loss of life and property, especially in densely populated regions of the world
  • Volcano facts and information | National Geographic
    Volcanoes give some warning of pending eruption, making it vital for scientists to closely monitor any volcanoes near large population centers Warning signs include small earthquakes, swelling or
  • What Is a Volcano? | NASA Space Place – NASA Science for Kids
    Volcanoes occur when material significantly warmer than its surroundings is erupted onto the surface of a planet or moon from its interior On Earth, the erupted material can be liquid rock ("lava" when it's on the surface, "magma" when it's underground), ash, cinders, and or gas There are three reasons why magma might rise and cause eruptions
  • Volcanoes - Education | National Geographic Society
    Volcanoes on the ocean floor become islands when the mountains become so large they rise above the surface of the ocean Credits Media Credits The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit The Rights Holder
  • Volcano facts and types of volcanoes | Live Science
    Volcanoes like Mount St Helens also often release pyroclastic flows, which are avalanches of hot rock, gas and ash that spill down the slopes at more than 200 mph (320 km h) Pyroclastic flows
  • Smithsonian Institution - Global Volcanism Program: Worldwide Holocene . . .
    The Global Volcanism Program (GVP) seeks better understanding of all volcanoes through documenting their eruptions--small as well as large--during the past 12,000 years The range of volcanic behavior is great enough, and volcano lifetimes are long enough, that we must integrate observations of contemporary activity with historical and geological records of the recent past in order to prepare
  • Types of Volcanoes - U. S. National Park Service
    Constructional volcanoes are topographic highs and are built by eruptions that build volcanic edifices Cinder cones, composite volcanoes, and shield volcanoes are constructional Excavational volcanoes have negative relief (below the general land surface) They form from either violent blasts or from collapse over a magma chamber





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