lab 3 doc Demari Grissom

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Georgia State University *

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1113

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Geography

Date

Dec 6, 2023

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docx

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4

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Lab 3: Plate Tectonics GEOG 1113L – Introduction to Landforms Lab Name: _____Demari Grissom________ I. The Saga of Supercontinents 1. What has driven the Earth’s advances and setbacks, explosions of life, and its extinction events? Earth's advances and setbacks are mainly caused by the movement of continents and plate tectonics. 2. What mid-20 th century discovery solidified the theory of continental drift? What is the significance of this feature? The discovery of undersea mountain ranges and undersea spreading in the atlantic solidified the continental drift theory. This is important because it further proves mountain ranges and trenches are created by tectonic plate movement and therefore the continents must move over time. 3. Another primary mechanism of plate tectonics is called ________, where oceanic crust slides under continental crust and begins to melt and mix with the mantle. Subduction 4. Kenorland was one of the Earth’s first supercontinents that formed __________ years ago and was not much bigger than __________. ~2.5-2.7 Billion years ago ; Australia 5. Which supercontinent existed at the same time as the Earth’s first animals? Did they live on the land? Pannotia 6. How many supercontinents were mentioned in the video? 7 7. What caused the two major extinctions of Pangaea? Volcanic eruptions polluting the water as well as blocking the sun 8. How fast are the continents moving? 2.5 centimeters per 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.
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