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Plate Tectonics

Plate Tectonics. By: Anthony Perkins. The Pangaea Theory. Pangaea was a supposed supercontinent made up of all our current continents. Alfred Wegener - In 1912 he came up with the theory Of Pangaea. The name means “all lands.” -He said Pangaea was probably intact

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Plate Tectonics

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  1. Plate Tectonics By: Anthony Perkins

  2. The Pangaea Theory • Pangaea was a supposed • supercontinent made up of all our • current continents. • Alfred Wegener - In 1912 he came up with the theory • Of Pangaea. The name means “all lands.” • -He said Pangaea was probably intact • Until late Carboniferous period. http://www.ucmp.berkeley.edu/geology/techist.html

  3. - other than geology he was accomplished in Astronomy, Meteorology and Climatology. These all helped him to come up with his theory/discovery. When Wegener first proposed the idea it was dismissed. - He could not provide an adequate explanation of the forces responsible for continental drift or disprove the theory that Earth was solid and immovable. http://www.ucmp.berkeley.edu/geology/techist.html

  4. Arthur Holmes • - His ideas later assisted in the recognition of Wegener’s theory. • - He elaborated on Wegener’s hypothesis. He said that thermal convection affects the mantle. It causes it to heat and cool. Heating and cooling over a period of time can cause a continent to split up and move. • - This received little attention at the time it was proposed. http://www.ucmp.berkeley.edu/geology/techist.html

  5. The theory being discussed at this time was the Contraction theory. • - This said that the Earth was once a molten ball and the act of cooling caused some parts of the Earth to fold in on itself. http://www.ucmp.berkeley.edu/geology/techist.html

  6. Convergent Boundaries • Convergent Boundary: A boundary were one plate overrides another one and forces it under. The one pushed under becomes part of the mantle again. Convergent Boundary Plate: A piece of the broken up lithosphere that floats on the asthenosphere. (top part of Earth.) Boundary: Where two plates meet. http://scign.jpl.nasa.gov/learn/plate4.htm

  7. What it causes: Mariana Trench • Mountains • Earthquakes • Volcanoes • Trenches Mountain Mountain: A raised spot on the Earth that comes to a Point.( a big hill.) Earthquake: A big shaking of the Earth from the motion of The plates moving. Trench: A dip in the ground formed by the two plates that meet. Volcano: An opening in the ground that magma come out of the Earth.

  8. One example of a Convergent Boundary is the Ring of Fire. • - A ring of volcanoes around the edges of the Pacific Plate. • - due precisely to there being a lot of convergent zones around there. Volcano http://scign.jpl.nasa.gov/learn/plate4.htm

  9. Divergent Boundaries • Divergent Boundary: At a Divergent Boundary two plates move away from each other. As the plates move away from each other mid- ocean ridges are formed because magma forces itself up through the cracks and cools. Mid-Ocean ridge • What it causes: • - Mid-Ocean Ridges http://scign.jpl.nasa.gov/learn/plate4.htm

  10. One example of a Divergent Boundary is the Mid-Atlantic range. - This helps to move North America and Europe farther apart. - The two plates involved in this are the North American plate andthe Mid-Atlantic Ridge Eurasian plate. http://scign.jpl.nasa.gov/learn/plate4.htm

  11. Transform Boundaries • Transform Boundary: A boundary were two plates slide past each other. Material is neither created nor destroyed. The plates just move past each other. Transform Boundary http://scign.jpl.nasa.gov/learn/plate2.htm

  12. Earthquake What it causes: - Earthquakes - Mudslides - Landslides Mudslide Landslide Mudslide: The rapid downward movement of earth caused by shaking Landslide: the falling or sliding of rock, soil, moss etc. http://scign.jpl.nasa.gov/learn/plate2.htm

  13. One example of a Transform Boundary is the San Andreas Fault. • - Fault that is in California. • - The North American and Pacific plates are moving past each other and it is the site of many earthquakes. San Andreas Fault http://scign.jpl.nasa.gov/learn/plate2.htm

  14. Real World Connections • The United States • - we live on the North American Plate. • - Most of the U.S. is on the North American Plate with the exception of Hawaii and some of California which are on the Pacific Plate. • - the U.S. is bordered by the Pacific Plate and the Juan de Fuca Plate. The United States http://geology.com/plate-tectonics.shtml

  15. Ohio is at risk of an Earthquake only if it is a very serious one. We feel them in Ohio but usually they are not very severe. • If the ancient Volcano in Yosemite were to blow again it would be disastrous. Ohio http://www.dnr.state.oh.us/OhioGeologicalSurvey/GeologyTopics/GeologicHazards/tabid/7902/Default.aspx

  16. In the very distant future California may break away from the United states. This is because of the San Andreas Fault. The Pacific Plate and the North American Plate could work it off just like Pangaea got worked apart. California https://geohazards.usgs.gov/

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