19-Ocean Floor - In-Austin Field Trip starts Wednesday Wear...

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In-Austin Field Trip starts Wednesday! Wear clothes and shoes you don’t mind getting a little dirty! Come to lab on time! Fill out waiver/insurance form before lab!
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Geology of the ocean floor Ocean ridge system Ocean trench system Major mountain belts Continental drift Some puzzling data Chapter 21: Ocean basins Next Lecture: Chapter 22
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Geology of the ocean floor Ocean ridge system Ocean trench system Major mountain belts Continental drift Some puzzling data Chapter 21: Ocean basins Next Lecture: Chapter 22
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Source: IDDP We start our tour in Iceland. In this map of the sea floor and adjacent land masses, we see that it lies on top of a ridge going along the ocean floor.
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Iceland is very volcanically active – a land of both ice and fire! Here we see a glacier actually flowing into a volcanic crevasse!
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The Eyjafjallajökull volcano in Iceland (A-yah-fyaddla-yoekuddl) Occasionally Iceland features very large eruptions, although for the most part the society has learned to live with them, much as in Hawaii. How would you like to wake up one morning and see this out your back window?
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Image from nasa.gov The Eyjafjallajökul eruption this Spring caused widespread disruption to air traffic in Europe; airborne volcanic glass can be very destructive to aircraft engines.
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One way Icelanders make the best of the situation is to extract energy from underground magma. By injecting water into deep holes and collecting the steam that comes out, they hope to provide for much of their energy needs.
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Currently-running steam plants already provide much power in Iceland. Tourists from around the world travel to swim in the warm, mineral-rich waters. Is geology good for your complexion? Some think so!
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Travelling southwest from Iceland, we see the ridge continue along the ocean floor into the North Atlantic. Then it seems to take a turn…
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Continuing through the Atlantic, we see the ridge system is composed of a series of generally north-south ridge segments connected by generally east-west segments, which we call “fracture zones” or “transform zones”. Note that the ridge segments are truncated by the fracture zones, whereas each fracture zone continues on to the east and west.
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