Lecture 7 (Monday, January 28 and Wednesday, january 30): Volcanoes and Volcanism
Brief outline of this lecture:
Kinds of volcanic materials.
Kinds of volcanoes or volcanic features.
Plate tectonic settings of volcanoes.
Volcanism's long-term significance.
Main points of this lecture:
Volcanic materials (lava, ash, etc) can be related to whether the magma from which they form is mafic or sialic.
Kinds of volcanoes be related to whether the magma from which they form is mafic or sialic.
Environmental hazards related to volcanism common relate to whether the magma being erupted is mafic or sialic.
Locations of many volcanoes are predictable from Plate Tectonics.
Columnar jointing results from localized contraction of cooling lava.
A caldera forms as the upper parts of a volcano collapse when a magma chamber empties under that volcano.
Volcanoes can influence and have influenced the global environment at annual to geologic time scales.
Figures used in this lecture:
Kinds of volcanic material
Kinds/Forms of volcanoes
Kinds/Forms of volcanoes II
Plate Tectonic settings of volcanoes
Sizes of pyroclastic eruptions
An explanation of columnar jointing
The long-term significance of volcanism
Reading assignment: Chapter 5.
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