Volcans Actifs sur Terre by MagikUnicorn
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Description
Volcanoes of the World
The most common perception of a volcano is of a conical mountain, spewing lava and poisonous gases from a crater at its summit. This describes just one of many types of volcano, and the features of volcanoes are much more complicated. The structure and behavior of volcanoes depends on a number of factors.
Some volcanoes have rugged peaks formed by lava domes rather than a summit crater, whereas others present landscape features such as massive plateaus. Vents that issue volcanic material (lava, which is what magma is called once it has escaped to the surface, and ash) and gases (mainly steam and magmatic gases) can be located anywhere on the landform. Many of these vents give rise to smaller cones such as Pu'u 'Ō'ō on a flank of Hawaii's Kīlauea.
Other types of volcano include cryovolcanoes (or ice volcanoes), particularly on some moons of Jupiter, Saturn and Neptune; and mud volcanoes, which are formations often not associated with known magmatic activity. Active mud volcanoes tend to involve temperatures much lower than those of igneous volcanoes, except when a mud volcano is actually a vent of an igneous volcano.
Volcanoes of the World
Thanks
Magik
Comments (67)
Supervolcanoes A supervolcano is a large volcano that usually has a large caldera and can potentially produce devastation on an enormous, sometimes continental, scale. Such eruptions would be able to cause severe cooling of global temperatures for many years afterwards because of the huge volumes of sulfur and ash erupted. They are the most dangerous type of volcano. Examples include Yellowstone Caldera in Yellowstone National Park and Valles Caldera in New Mexico (both western United States), Lake Taupo in New Zealand, Lake Toba in Sumatra, Indonesia and Ngorogoro Crater in Tanzania. Supervolcanoes are hard to identify centuries later, given the enormous areas they cover. Large igneous provinces are also considered supervolcanoes because of the vast amount of basalt lava erupted, but are non-explosive. Submarine volcanoes Submarine volcanoes are common features on the ocean floor. Some are active and, in shallow water, disclose their presence by blasting steam and rocky debris high above the surface of the sea. Many others lie at such great depths that the tremendous weight of the water above them prevents the explosive release of steam and gases, although they can be detected by hydrophones and discoloration of water because of volcanic gases. Pumice rafts may also appear. Even large submarine eruptions may not disturb the ocean surface. Because of the rapid cooling effect of water as compared to air, and increased buoyancy, submarine volcanoes often form rather steep pillars over their volcanic vents as compared to above-surface volcanoes. They may become so large that they break the ocean surface as new islands. Pillow lava is a common eruptive product of submarine volcanoes. Hydrothermal vents are common near these volcanoes, and some support peculiar ecosystems based on dissolved minerals. Subglacial volcanoes Subglacial volcanoes develop underneath icecaps. They are made up of flat lava which flows at the top of extensive pillow lavas and palagonite. When the icecap melts, the lavas on the top collapse, leaving a flat-topped mountain. Then, the pillow lavas also collapse, giving an angle of 37.5 degrees[citation needed]. These volcanoes are also called table mountains, tuyas or (uncommonly) mobergs. Very good examples of this type of volcano can be seen in Iceland, however, there are also tuyas in British Columbia. The origin of the term comes from Tuya Butte, which is one of the several tuyas in the area of the Tuya River and Tuya Range in northern British Columbia. Tuya Butte was the first such landform analyzed and so its name has entered the geological literature for this kind of volcanic formation. The Tuya Mountains Provincial Park was recently established to protect this unusual landscape, which lies north of Tuya Lake and south of the Jennings River near the boundary with the Yukon Territory. Volcanoes of the World
Excellent maps and information! Thanks!!
Impressionante montagem e gama de informaçãoes meu amigo, excelente, obrigado, aplausos (5)
Cool
Would make a great teaching tool.. wonderful work, I don't see any near by me I think I can sleep easy tonight. :)
you put this map toghter wonderful. lot of information too
Excellent image and information, Magik!
Great work on this!
MUY BUEN TRABAJO GRAFICO, MUCHAS GRACIAS POR COMPARTIRLO.
Magik, thanks for sharing.
Well done Magik!!!
Ground shaking!Thanks for the map and info my friend!Most excellent!
Yes a lot of sysmic activity, makes you wonder, what's next...
Great work!!!
YOU HAVE BEEN FAVORITIZED!!!
Nice picture map of where the volcano's are and great info to add. Excellent work. Aloha
Oh...Sakurajima!! Cool and interesting information. great work!!
very nice and informative chapter.
wow..thanks for the info my friend...i heard some of this in a tv documental...thanks you so much!
Superb and informative upload Magik! Excellent!
Fantastic work.
Aparrament les volkans autour du Rhin (Eifel) = Mare, commence aussi a se remuer un peut, bulles d'air chaud dans cette partie du Rhin - ça sera la catastrophe pur!!!! Merci our les infos, bisou Ute
Fantastic presentation! Those things are beautiful but scary! (:
jolie carte!!
wonderful image, but you forget the Vesuvio (Pompei and Ercolano volcano, last eruption 1843, and Etna in Sicily last eruption 2007.
great work!!
Wow...excellent and interesting.
Great maps and wonderful info! Excellent done!!
Very interesting indeed.
C'est bien de nous rappeler que nous sommes posés sur une gigantesque bombe...si nous y pensions plus souvent, nous serions peut-être plus raisonnables (peut-être !!!). Quand on voit la panique provoquée par une seule éruption, on imagine le cirque si plusieurs volcans se réveillaient en mêmetemps !