Lab 3 Assignment_Online mack

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Georgia State University *

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1113L

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Geography

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Apr 3, 2024

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docx

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6

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Lab 3: Plate Tectonics GEOG 1113L – Introduction to Landforms Lab Name: Adrian Mackins I. The Saga of Supercontinents 1. What has driven the Earth’s advances and setbacks, explosions of life, and its extinction events? The movement of continents 2. What mid-20 th century discovery solidified the theory of continental drift? Mid-ocean Ridges/ seafloor spreading What is the significance of this feature? it is where the sea floor is made 3. Another primary mechanism of plate tectonics is called subduction , where oceanic crust slides under continental crust and begins to melt and mix with the mantle. 4. Kenorland was one of the Earth’s first supercontinents that formed 2.7 to 2.5 billion years ago and was not much bigger than _ Australia_ 5. Which supercontinent existed at the same time as the Earth’s first animals? Pannotia Did they live on the land? No 6. How many supercontinents were mentioned in the video? 8, Kenorland, Pangea, Nuna, Rodinia, Gondwana, Euramerica, Laurasia, and Pannotia 7. What caused the two major extinctions of Pangaea? It was probably caused by a series of massive volcanic eruptions from fissures in Pangea 8. How fast are the continents moving? 2.5 centimeters a year
II. Plate Boundaries Open the PowerPoint “Lab 3 Part II_Plate Boundaries”. Read through the definitions and hints on the first slide of the PowerPoint. Draw at least two convergent boundaries and two divergent boundaries on the map using the “Draw” tab in the second slide of the PowerPoint. Make your divergent boundaries green and your convergent boundaries red . Draw arrows on each side of your boundaries to indicate which direction the plates are moving. Upload your completed PowerPoint activity along with your completed lab assignment document to the Lab 3 assignment submission folder on iCollege.
III. The Tectonic Cycle Use the diagram below to help you answer the question. 1. In your own words, describe the lifecycle of Earth’s tectonic plates. Be sure to use the labels in the image to help you provide as much detail as possible. It seems like the plates formation starts at the core mantle boundary, also when the crust is formed. The crust is separated by the mid ocean ridge. As plates move away from the boundaries, they become apart of the Lithosphere. Over time, at convergent boundaries, plates collide, leading to subduction zones where one plate sinks beneath another, completing the cycle.
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