dinámica de la tierra
TRANSCRIPT
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Autor:Antonio Cereceda
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The Earth’s structure
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Alfred Wegener and the continental drift theory
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Concordancia de los continentes
Evidencias glaciares
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Matching mountain ranges
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Distribution of Fossils
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Pacific Ring of Fire
Hotspot volcanoes
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• As with volcanoes, earthquakes are not randomly distributed over the globe
• At the boundaries between plates, friction causes them to stick together. When built up energy causes them to break, earthquakes occur.
Figure showing the distribution of earthquakes around the globe
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Plate Boundaries
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The Age of Oceanic Crust
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• Iceland has a divergent plate boundary running through its middle
Iceland: An example of continental rifting
Animación sobre bordes divergentes
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Oceanic and continental plates colliding
El proceso de subducción
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• Oceanic lithosphere subducts underneath the continental lithosphere
• Oceanic lithosphere heats and dehydrates as it subsides
• The melt rises forming volcanism
• E.g. The Andes
Subduction
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Himalayas: two continental plates colliding
Animación de la colisión India- Asia
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Plates sliding past each other
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Aerial view of the San Andreas Fault
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