Y8 wk33 plate_tectonics_ppp

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Acep, science, plate tectonics

Acep, science, plate tectonics

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  • 1. Homework: Hand in Answers to Question #2a.b.c Tell Ms. Melanie your project group members. Lab work: 1. Build 12 sugar cube houses. Stick them together with Peanut Butter, Nutella, or margarine. Build each one on a piece of WAX paper. 2. Create Clay (Play Do) Soil Tray.
  • 2. What is your name? __________ 2. Which layer of the Earth is the densest? What are two differences between Compositional Layers and Physical Layers? Earth’s Crust layer is also called the ___________. Which layer does the crust (tectonic plates) move on? 1. 3. 4. 5. Please sign your name and hand in Or Complete on your cell phone!
  • 3. Pg. 202 – 213 in Dynamic Earth textbook
  • 4.   Can you name all continents? What are they? With a partner, try to list as many as you can.
  • 5. How many continental plates are there?* main ones _______ 15
  • 6.  In1800, Alfred Wegener thought about this idea Continents were once 1 land form (Pangaea) They moved apart over time!  Evidence to support his hypothesis   ◦ Fossils found across the ocean on another continent ◦ Location of mountain ranges and rock formations across the ocean, rocks are the same age ◦ Tropical fossilized plants found in Arctic zones.
  • 7.  Single landmass Thought to exist 245 million years ago   Began to drift apart Himalayas formed from Indian plate colliding with Eurasian plate. 
  • 8.  Pangaea The plates move due to convection currents in the mantle. 
  • 9.  Lava (magma) rises through the cracks in the oceanic crust. It cools and forms new crust (lithosphere).  Mostly occurs in the sea.   Evidence: -Rock samples are young (not old) - sea floor is not smooth, but rough with large trenches
  • 10.  WHY ISN’T EARTH GETTING BIGGER? Mid Ocean Ridge
  • 11.   Ocean Trenches: deep canyons in ocean floor Older crust is sinking (subducting) into the asthenosphere at the same rate new crust is forming.
  • 12.     Describes large scale movement of Earth’s lithosphere (by Convection in the Mantle) Explains volcanoes, mountains, and earthquakes Tectonic Plate: lithosphere is divided into rock pieces Plates move on asthenosphere in different directions and speeds.
  • 13. Click above for a short video!    Most crustal changes occur at plate boundaries 3 main types: *Divergent (Drift Apart) *Convergent (Come Together) *Transform (Sliding)
  • 14.    2 plates move away from each other Sea floor spreading, mid ocean ridge is created (if 2 oceanic plates). New crust is created
  • 15.     Occurs when 2 plates collide. 2 continental plates colliding = mountains 2 oceanic plates colliding = ocean trenches (subduction) Ocean and continental plate colliding = oceanic plate subducts continental plate. Volcanoes occur.
  • 16.    2 plates slide past each other horizontally Ex: San Andreas Fault in California (USA) Sudden movement becomes earthquakes
  • 17.      http://ees.as.uky.edu/sites/default/files/elea rning/module04swf.swf Click the above link to watch pangaea unfold. Look at where volcanoes and earthquakes commonly occur. Find the plate boundaries and note the countries on them. Where is Thailand? Is there a connection between land formations (mountains, volcanoes, earthquakes) and plate boundaries?
  • 18. 1. 2. What theory did Alfred Wegner form in the 1800s? He formed the theory of Continental Drift. What was the single landmass called that broke apart 245 million years ago? It was called Pangaea. 3. What happens at Divergent boundaries? Plates move apart. In the ocean, the is called sea floor spreading. New crust is formed. 4. Give 2 pieces of evidence for Continental Drift. 5. 1. Rocks the same age were found on both sides of the ocean. 2. Tropical plants were found in Arctic zones. If the sea floor spreads and new crust is created, why isn’t the lithosphere getting bigger? Some oceanic plates are subducting continental plates at Convergent boundaries.