igneous structures volcanic
Download
Skip this Video
Download Presentation
Igneous Structures: Volcanic

Loading in 2 Seconds...

play fullscreen
1 / 63

Igneous Structures: Volcanic - PowerPoint PPT Presentation


  • 72 Views
  • Uploaded on

Igneous Structures: Volcanic. Viscosity. Units: pascal-seconds (kg/m-sec) How many pascals pressure x how many seconds to squash fluid flat? Viscous: Material flows as long as pressure is applied, however small Pseudoviscous: Material flows after some threshold stress.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Igneous Structures: Volcanic' - sofia


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
viscosity
Viscosity
  • Units: pascal-seconds (kg/m-sec)
  • How many pascals pressure x how many seconds to squash fluid flat?
  • Viscous: Material flows as long as pressure is applied, however small
  • Pseudoviscous: Material flows after some threshold stress
what drives magma
What Drives Magma?
  • Magma is typically 10% lighter than equivalent solid rock
    • Why pressure inhibits melting
  • Buoyancy drives magma upward
    • Weight of rock around volcanic conduit > weight of magma
  • Gas pressure powers volcanic eruptions
  • Mafic (dense) rocks can sink in crust by viscous flow
tambora 1815
Tambora 1815

1816: “Year Without A Summer”

  • 100 cubic km of ash erupted
  • Global sunset color effects for months
  • New England
    • Snow in June and August, Frost in July
    • Exodus to Midwest
  • Europe: High prices, food riots
ad