Class Notes (836,580)
Canada (509,856)
EARTHSC 2GG3 (199)
Lecture

Volcanoes.docx

3 Pages
143 Views
Unlock Document

Department
Earth Sciences
Course
EARTHSC 2GG3
Professor
Sergei Basik
Semester
Winter

Description
Volcanoes Volcano and Lava Types  Higher Silica content  higher viscosity  more explosive  Lower silica content  lower viscosity  less explosive  Basalt lave = quiet eruptions; most oceanic volcanic and hawaiian made of this  Rhyolite = very explosive, rhyolite domes in Yellowstone park; whiteish grey  Ignious = rocks made from volcanic activity; lighter colour  Olivine – found in common lava in Hawaii  High viscosity = granite  Low viscosity = bubbles formed due to rapid cooling  Magma – molten rock  Lava- magma that flows onto ground surface Products of Volcanoes  lava  Pyroclactic Material – fragment of solidified magma blown out of volcano, fragments (small and large) may be deposited by pyroclactic density current PDC (hot flow and billowing tephra  Lahar – mudslide of volcanic material ; can bury buildings Basaltic Lava Forms  Low Viscosity Flow  Pahoehoe Flow: basalt lava with a ropy or smooth top ; flows quickly  High Viscosity FLow  Aa Flow: blocky basalt lava with a ragged, clinker surface Shield Volcanoes  Ones in Hawaii  Huge volcanoes, due to low viscosity lava  Largest type Mauna Loa and Kilauea, Hawaii  Eruption below sea level produce volcanoes ; basalt lava flows  Loose now became above sea level  Hotspot stays in same spot, but volcanoes moves w. crust and so older volcanoes are further away from the hotspot Mount Etna (Italy)  Most active volcano in Europe  Actively erupting since 1992  Erupts basalt lava continuously  Periodically erupts pyroclactic debis on more explosive eruptions  Latest eruption Jan 12 2011 Basalt Volcanoes Along Oceanic Ridges  At oceanic spreading centers hot mantle rock rises, and as it nears the surface, it partially melts erupting along the ridge as fluid basalt flows and pillow basalt formations  Pillow basalts – made as hot lava hits cool water body Flood Basalts  A broad expanse of basalt lava that cooled to fill in low-lying areas of the landscape  Flood basalt – basalt that spreads out over large area Pyroclactic Material  Pyroclactic : fragmental material blown out of a volcano (eg. tephra, cinders, and bomb
More Less

Related notes for EARTHSC 2GG3

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit