Plate Tectonics SPI 0707.7.5 Recognize that lithospheric plates continually move at rates of centimeters per year. SPI 0707.7.6 Describe the relationship.

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Presentation transcript:

Plate Tectonics SPI 0707.7.5 Recognize that lithospheric plates continually move at rates of centimeters per year. SPI 0707.7.6 Describe the relationship between plate movements and earthquakes, mountain building, volcanoes, and sea floor spreading.

Introductory Video Clip- -Plate Tectonics Introduction https://www.youtube.com/watch?v=kwfNGatx UJI

Academic Vocabulary Pangaea - theory that “all land” was once joined. Continental Drift - idea that land masses move apart over time. Seafloor Spreading – continents are moving apart at a rate of 1cm per year. Convergent Boundary - boundary where two plates collide. Divergent Boundary - boundary where two plates move away from each other Transform Boundary - boundary where plates slide past one another Harry Hess – known for the idea of seafloor spreading Alfred Wegner – developed the theory of Pangaea

3 Plate Boundaries Convergent Boundary-where two plates COLLIDE. Divergent Boundary-where two plates move apart…DIVIDE. Transform Boundary-where two plates SLIDE against each other.

Convergent Boundary = Collide Mountain ranges often form where tectonic plates push against each other.

Convergent = Subduction Zone A subduction zone is where one tectonic plate sinks under the other. Hint…the prefix “sub” means under

Video Clip - Convergent Boundary https://www.youtube.com/watch?v=xqeKxh6NIIE

Divergent Boundary = Divide

Divergent = “Seafloor spreading” Harry Hess— This theory put forth by Harry Hess says that there are cracks in the sea floor and the two plates are actually being pulled apart…Dividing. Is this plate movement convergent or divergent??? 9

Video Clip - Divergent Boundary https://www.youtube.com/watch?v=wbEqKFKmDlY

Continental Drift 1cm per year. Why? The theory of continental drift says that the continents have slowly moved apart. 1cm per year. Why? “Pangaea” - Alfred Wegner’s proposed theory that all land was joined together in the past. Pangaea = “all land”

Transform Boundary= Slide Where two plates slide past each other, earthquakes are known to occur.

Transform Boundary - Transform Boundary https://www.youtube.com/watch?v=PcvYDSWPJW8

Earth’s Plate Boundaries What do you think all the dark black lines represent?

Video Clip- Layers of the Earth Rap https://www.youtube.com/watch?v=RiHRI_Z2Kgs

Bell Ringer #1 Scientists theorize that the Atlantic Ocean is slowly increasing in width. Which is the best approximation of the rate at which lithospheric plates beneath the Atlantic Ocean are moving? a. 2 millimeters per year b. 2 meters per year c. 2 centimeters per year d. 2 kilometers per year

Bell Ringer #2 The Andes Mountains of South America were gradually formed when the Nazca and South American tectonic plates collided. Which of these caused this collision? a. convection currents in Earth’s mantle b. volcanic activity in Earth’s crust c. movement of material within Earth’s core d. changes in Earth’s magnetic field

Fossil Clues??? How do fossil clues support Wegner’s idea of Pangaea? Where??