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PLATE TECTONICS

PLATE TECTONICS. By: Karl Quilligan. Map of U.S.A. SECTION 1. HISTORY OF PANGEA: - Pangaea or “all Earth” existed until about 300 million years ago during Carboniferous period

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PLATE TECTONICS

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  1. PLATE TECTONICS By: Karl Quilligan

  2. Map of U.S.A

  3. SECTION 1 HISTORY OF PANGEA: -Pangaea or “all Earth” existed until about 300 million years ago during Carboniferous period -Scientist & geologist Alfred Wegener developed idea of Pangaea, he was ridiculed for his theory because they didn’t have much proof about Pangaea -Wegener was a meteorologist as well as a geophysicist and won many awards in both backgrounds -Arthur Holmes helped prove Wegener’s theory

  4. Pangaea Alfred Wegener

  5. SECTION 2 Convergent Boundaries: -an edge of a lithospheric plate tectonic, usually at the edge of a continent -Hazards of convergent boundaries are avalanches, mudslides, landslides, earthquakes, trenches, and volcanoes -The Rockies in North America lie on the North American and Juan de Fuca Plate

  6. HAZARDS OF CONVERGENT BOUNDARIES Mudslide – downward movement of wet/saturated Earth Landslide – falling/sliding of a mass of soil or rock down a steep slope Volcanoes – vent in Earth’s crust through which lava, ash, and steam are expelled

  7. Hazards of Convergent Boundaries (cont.) Mountains – natural elevation abruptly rising to a summit, larger than a hill Trenches (in black) – long steep-sided depression in the ocean floor Avalanche – mass of snow and ice sliding down a mountain Earthquakes – series of vibrations that cause the Earth’s crust to move and or crack

  8. EARTH’S TECTONIC PLATES AND MOVEMENTS Boundary – where a plate ends or changes to another plate e.g. - end of North American plate – start of Atlantic plate

  9. Section 3 Divergent Boundaries – locations where plates are moving away from each other, occurs above rising convection currents -Hazards include volcanic “leaks,” a volcanic leak is when lava runs down hills, it doesn’t erupt, it just leaks, you also have to be careful of rifts and rift valleys, they form from two faults pulling apart -Iceland is splitting right down the middle, it lies along the Mid-Atlantic Range, a divergent boundary

  10. Rift Valleys

  11. Section 4 • Transform boundary -Transform Boundaries are locations where two plates slide past one another. The fracture zone that forms a transform plate boundary is known as a transform fault. Most transform faults are found in the ocean basins • Hazards are mainly earthquakes, mudslides, landslides, and avalanches (depending on climate) • A well-known transform fault/boundary is the San-Andreas fault on the west coast of the U.S, it lies on the North American plate

  12. Section 5 • We live on the North American plate, all of the U.S (except Hawaii) is located on this plate • The Cocos, Pacific, Eurasian, Caribbean, and African plates border the North American plate • In Ohio, we are nowhere near the edge of a plate, therefore, we don’t have to worry about any rifts, avalanches, earthquakes, or volcanic activity, however, in places like California where they have a fault earthquakes can be a major problem • In the near future, I don’t think any major disasters will happen, (unless you believe in the 2012 apocalaypse)

  13. WORKS CITED • http://wiki.answers.com/Q/List_an_example_of_a_Convergent_Boundary_and_the_continental_plates_involved_in_that_boundary • http://media.maps.com/magellan/Images/tectonic.gif • http://geology.com/nsta/divergent-plate-boundaries.shtml • http://www.merriam-webster.com/dictionary/rift+valley • http://geology.com/nsta/transform-plate-boundaries.shtml • http://nagelbeelmanscience.wikispaces.com/

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