Transcript Natural Disasters

Natural Disasters
By: Patrick L. Abbott
Chapter 6
Volcanoes
Overview
Anatomy of an Eruption
Chemical and Mineral Composition of
Magmas
Temperature, Gas Content, and Viscosity
of Magmas
Volcanic Landforms
Eruptive Styles
Collapse Calderas
Anatomy of an Eruption
Springs
Geysers
How a Geyser Erupts
Pores
How a Volcano Erupts
Viscosity
Chemical and Mineral Composition
of Magmas
Minerals
Crystallization
Rocks
Plutonic rocks
Volcanic rocks
Chemical and Mineral Composition
of Magmas (cont.)
Volcanic Materials
Pyroclastic
Pahoehoe
aa
Pillow lava
Obsidian
Pumice
Temperature, Gas Content, and
Viscosity of Magmas
Basalt
Andesite
Rhyolite
Volcanic Landforms
Sills
Dikes
Cinder Cones (Basaltic to Andesitic)
Volcanic plug
Stratovolcanoes (Andesitic to Rhyolitic)
Composite volcanoes
Shield Volcanoes (Basaltic)
Eruptive Styles
Icelandic-type
Fissures
Lava Flows of 1973
Hawaiian-type
Strombolian-type
Volcanian-type
Eruptive Styles (cont.)
Vesuvian-type
Vesuvius, 79 C.E.
Pyroclastic flows
Lahars
Plinian-type
Plinian eruption
Pelean-type
Collapse Calderas
Crater Lake (Mount Mazama), Oregon
Caldera
Krakatau, Indonesia, 1883
Santorini and the Lost Continent of
Atlantis