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Geology 101 Week 6 Notes

by: Delo Baker

Geology 101 Week 6 Notes ESS 101

Marketplace > Environment > ESS 101 > Geology 101 Week 6 Notes
Delo Baker
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About this Document

Introduction to Geological Sciences
Swanson, Terry W
Class Notes
25 ?




Popular in Introduction to Geological Sciences

Popular in Environment

This 2 page Class Notes was uploaded by Delo Baker on Friday November 6, 2015. The Class Notes belongs to ESS 101 at a university taught by Swanson, Terry W in Fall 2015. Since its upload, it has received 53 views.


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Date Created: 11/06/15
Week 6 November 2nd November 2 nd  Volcanism o Volcanic hazards are strongly tied to the viscosity and gas content of the magma o Basaltic composition eruptions are non-explosive o Basaltic eruptions occur at different tectonic settings around the world o Iceland is situated over the mid Atlantic seafloor spreading margin  Many hotspots  located near the artic circle o Pyroclastic eruptions  Associated with subduction zone volcanism  Mt Vesuvius  Erupted 79ad o Destroyed Pompeii & Herculaneum o Lahar flows  Generated when snow or glacial ice is melted by hot pyroclastic  Dangerous and difficult to predict magnitude o Risk Assessment  Magnitude of event  Frequency of event o Prior to an eruption, seismic activity was frequent as the magma moved upward beneath the volcano November 6th  Weathering o Rock will physically and chemical break down to produce sediment o Physical weathering  Break down rock or sediment into small constituent fractions without changing the chemistry o Chemical weathering-  Chemical reaction with primary minerals that change their mineralogy so a more stable compound o Joint fracture  Increase the surface area of the rocks  Permits water to infiltrate below the surface and facilitate weathering o Freeze thaw weathering (frost wedging)  Must have differentiation between freezing and melting  Above 0 C and Below 0 C o Fire- induced spalling-  Thermal expansion of outer rock surface with exposure to range or forest fire  Rapid expansion and contraction of hydrous minerals during heating and cooling o Biotarbation –life forms  Root wedging  Termites  Earth worms  humans 2


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