plate tectonics - pangaea :// 2009
TRANSCRIPT
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Plate Tectonics - PANGAEAhttp://www.middleschoolscience.com 2009
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Evidence of Pangea
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Continental Drift
http://members.enchantedlearning.com/subjects/astronomy/planets/earth/Continents.shtml
Alfred Wegener 1900’sContinents were once a single land mass that drifted apart. Theory is called continental drift.
Fossils of the same plants and animals are found on different continents
Called this supercontinent Pangaea, Greek for “all Earth”
250 Million years ago
Split again – Laurasia & Gondwana 180 million years ago
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Tectonic Plates- major and minor
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How Plates Move- convection currents in the mantle causes hot magma to rise and sinks as it cools. This
movement results in the movement of the lithosphere/crust.
http://pubs.usgs.gov/gip/dynamic/unanswered.html
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Earth’s LayersThe Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed.
This crust is not a solid shell; it is broken up into huge, thick plates that drift atop the soft, underlying mantle.
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The Crust
• Outermost layer• 5 – 100 km thick• Made of Oxygen, Silicon, Aluminum
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The Mantle• Layer of Earth
between the crust and the core
• Contains most of the Earth’s mass
• Has more magnesium and less aluminum and silicon than the crust
• Is denser than the crust
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The Core
• Below the mantle and to the center of the Earth
• Believed to be mostly Iron, smaller amounts of Nickel, almost no Oxygen, Silicon, Aluminum, or Magnesium
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Plate Tectonics
• “tektonikos” means “builder” in GREEK• Pieces of the lithosphere that move around• Float on top of mantle’s asthenosphere similar
to ice cubes in a bowl of water• Each plate has a name• Fit together like jigsaw puzzles
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Sea Floor Spreading
• Mid Ocean Ridges – underwater mountain chains that run through the Earth’s Basins
• Magma rises to the surface and solidifies and new crust forms
• Older Crust is pushedfarther away from the ridge
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Different Types of Boundaries
http://pubs.usgs.gov/gip/dynamic/understanding.html
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Divergent Boundary – Arabian and African Plates
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Convergent Boundary – Indian and Eurasian Plates
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Convergent Boundary – Oceanic & Continental (denser oceanic crust will dive under the less dense continental crust, creating
volcanoes or trenches
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
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Convergent Boundary – Oceanic & Oceanic (one will dive under the other due to density. This may result in
the formation of a trench or volcanoes.
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
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Convergent Boundaries – Continental & continental crust create mountains
http://pubs.usgs.gov/gip/dynamic/understanding.html & http://www.geology.com
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Transform Boundary – when 2 plates slide past each other due to friction, usually resulting in earthquakes.
www.geology.com
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Review
• Name the 3 main layers of the Earth• What is a tectonic plate?• What was Pangea?• What is Sea-Floor spreading?• Name the three different types of plate
boundaries and one location on Earth for each one