Geology 1 - Planet Earth

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Geology 1 - Planet Earth
Deserts and Winds

Oceans and Shorelines
tom.h.wilson wilson_at_geo.wvu.edu
Department of Geology and Geography West Virginia
University Morgantown, WV
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Interactive review of desert types and the
mechanism responsible for their formation.
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Interactive review of the worlds major deserts.
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Wind Deposits
Dune formation -

• Windshadow
• Dune Migration

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Windshadows
Duncan Heron
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Dune Stabilization
Duncan Heron
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Oceans and Shorelines
Recall basic ideas about plate tectonics
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Tectonic Plates
Pangaea
Pieces of a puzzle
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Mapping the seafloor with Sonar
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Most people dont realize that mountains beneath
the surface of the ocean attract water through
the force of gravity. The water pulled toward the
mountain produces a little hill in the surface of
the ocean
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Map of the ocean floor obtained from satellite
radar observations of ocean surface topography.
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Detailed map of a triple-junction on the floor of
the Indian Ocean derived from ocean surface
topography
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Ocean floor topography is largely controlled by
plate tectonic processes including the formation
of mid-ocean ridges, subduction zones and
transform fault zones.
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Ocean Floor Travel and Accretion
Koji Wakita
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Submarine fan
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Koji Wakita, Yukio Kawamura
Accretionary prism development
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Radiolarian - planktonic marine protozoans of
microscopic size that secrete skeletons of silica.
Koji Wakita, Yukio Kawamura
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Koji Wakita
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A delicious treat for a subduction zone.
Koji Wakita
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Overturned seamount reef reaches land just in
time to become tourist cave system.
Koji Wakita
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The shapes of these radiolaria change
systematically over geologic time periods, so
that they make very useful time markers.
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The ocean floor - A great place to build a castle
Koji Wakita
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How does the crust move along a transform fault?
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Seamount - a peak (usually a shield volcano) that
rises at least 3000 feet above the ocean floor.
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Guyot- a seamount whose top has been flattened by
wave action.
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Reef classification and development
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Continue Reading Chapter 16 -
Oceans and Shorelines