Slideshow 101.20 Volcano Overview III

Slideshow 101.20 Volcano Overview III - Volcano Overview...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon
Volcano Overview III Overview I covered: Factors controlling eruptions Types of eruptions (2 main) Some types of deposits Overview II covered: Pyroclastic Flows (nuée ardente) Lahars Overview III covers Volcanic gases and climate VEI Eruption styles
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Volcano Overview III Gases— (vo la tile s ) He ld in m a g m a  by c o nfining  pre s s ure ,  whe n pre s s ure  dro ps  the n g as e s   e s c a pe .   G a s e s  fro m  within the  Ea rth— vo lc a no e s  pro vide  a n e s c ape   m e c ha nis m G a s e s  that c o m e  o ut o f vo lc ano e s   g re a tly influe nc e  the  c o m po s itio n o f  o ur a tm o s phe re 1-9% of total weight of magma 70%  wate r 15%  C O 2 5% N 2 5% SO 2 5% Cl 2 , H 2  and Ar
Background image of page 2
Volcano Overview III SO 2 gas can be especially nasty In the atmosphere it combines with water vapor, producing H 2 SO 4 .  This sulfuric acid  can remain suspended in the atmosphere for years producing extended periods of acid rain.  Increasing the acidity of local, regional and global waters       
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Volcano Overview III When Mount Pinatubo erupted in When Mount Pinatubo erupted in the Philippines June 15, 1991, ~ the Philippines June 15, 1991, ~ 20 20 million tons of sulfur dioxide million tons of sulfur dioxide and and ash particles blasted more than 12 ash particles blasted more than 12 miles (20 km) high into the miles (20 km) high into the atmosphere. atmosphere. Gases and solids injected into the Gases and solids injected into the stratosphere circled the globe for stratosphere circled the globe for three weeks. three weeks. Volcanic eruptions of this Volcanic eruptions of this magnitude can impact global magnitude can impact global climate, reducing the amount of climate, reducing the amount of solar radiation reaching the Earth's solar radiation reaching the Earth's surface, lowering temperatures in surface, lowering temperatures in the troposphere, and changing the troposphere, and changing atmospheric circulation patterns. atmospheric circulation patterns.
Background image of page 4
Volcano Overview III C lim a te  c ha ng e :   G a s e s  inje c te d up into  the  atm o s phe re   ( stratosphere -10-50km  o f atm ) c a n  La rg e  s ulfuric -a c id dro ple ts  (ae ro s o ls )
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 6
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/11/2008 for the course GEOL 101 taught by Professor Winstonnorrish during the Fall '07 term at Central Washington University.

Page1 / 22

Slideshow 101.20 Volcano Overview III - Volcano Overview...

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online