Slideshow 101.18 Volcano Overview I

Slideshow 101.18 Volcano Overview I - Volcano Overview I...

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Volcano Overview I VOLCANO   What they are…  An opening, or rupture, in a planet's surface or crust    which  allows molten rock to reach the surface.   A mountain built from the products of an eruption. Cleveland Volcano Aleutian Islands, Alaska . .from the International Space Station
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Volcano Overview VOLCANOES Where they form… Vo lc a no e s  fo rm  in  a  va rie ty o f te c to nic   s e tting s  whe re   m a g m a  re a c he s   the  s urfa c e . Subduction Zone Rift Hot Spot Mod-ocean Ridge
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Volcano Overview Volcano Architecture Volcano Architecture Plumbing Plumbing
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Volcano Overview Volcano Architecture volcano collapses down into emptied void to form a caldera. 100x30 km Lake Toba Caldera 74,000 BC 2800 KM 3  material
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Volcano Overview Vo lc a no  S truc ture  – s ha pe s  a nd s ize s Ha wa ii – the  ta lle s t  Ha wa ii – the  ta lle s t  m o unta in in the  wo rld m o unta in in the  wo rld
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Volcano Overview Let’s Examine: Factors Controlling Eruptions Types of Eruptions Volcanic Deposits
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Volcano Overview Factors controlling types of eruptions  Vis c o s ity  o f m a g m a  Te m pe ra ture  Ma g m a  C o m po s itio n   G a s  c o nte nt o f m a g m a
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Volcano Overview Factors controlling types of Volcanic Eruptions VISCOSITY   = re s is ta nc e  to  flo w – it de pe nds  o n: Temperature : he a t lo we rs  vis c o s ity (he a ting  s yrup) Magma composition  Vis c o s ity is  dire c tly re la te d to  s ilic a  c o nte nt   S ilic a  c ha ins  +-+-+-+- fo rm  e ve n b e fo re   c rys ta lliza tio n b e g in  Mo re  S ilic a  = Mo re  vis c o us
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Slideshow 101.18 Volcano Overview I - Volcano Overview I...

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