geology 4
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Bucks County Community College *
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103
Subject
Geology
Date
Apr 3, 2024
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1
Uploaded by BarristerGorilla980
Plate Tectonics Lab 8. The rock that most closely resembles the composition of continental crust based on the description in the previous section is: b. B ¢c.C d.D 9. Based on the choice you made for question 8, what is the density of the rocks that make up continental crust? Please give your answer in grams/milliliter. élL.Z) / [ i 7%= 0,271 gpafwm 10. The rock that most closely resembles the composition of oceanic crust based on the description in the previous section is: a. A b.B c.C @D 11. Based on the choice you made for question 10, what 1s the density of the rocks that make up oceanic crust? Please give your answer in grams/milliliter. / 7 ? 7 / (/éo = O 3?0 7'14 / mm 12. Remember, because of isostasy the denser plate will be lower than the less dense plate. If oceanic and continental crust collided, based on their densities the crust would sink below the crust. a. continental; oceanic @oceanic; continental Plate Boundaries Overview Tectonic plates can interact in three different ways they can come together, they can pull apart, or they can slide by each other (Figure 4.6). The other factor that can be important is the composition of the plates (oceanic or continental crust) that are interacting as was explored in the previous section. These three types of motions along with the type of plates on each side of the boundary can produce vastly different structures and geologic events (Table 4.1). Two plates that are moving apart from each other are called Divergent. Divergent boundaries are important because they are the way that continents split apart and break into separate plates as well as where new ocean crust is formed. If a divergent boundary forms within a continent that area stretches apart. This results in the area becoming thinner creating a topographic low or a valley. This extension 1s not a smooth process so the area is prone to earthquakes as well as volcanic activity. Eventually, the crust gets so thin it will rupture forming a gap between the plates, which will be filled with molten rock forming new oceanic crust. A thin and dense plate will be topographically low and will be covered in water forming a long and narrow sea. As the plates persist in pulling apart new crust is continually being formed at the plate boundary along an elevated crest known as a mid-oceanic ridge. The LibreTexts libraries are Aand are supported by the Department of Education Open Textbook Pilot Project, the UC Davis Office of Pa g e |9 the Provost, the UC Davis Library, the Califomia State University Affordable Leaming Solutions Program, and Meriot. We also acknowledge previous National Scence Foundation support under grant numbers 1246120, 1525057, and 1413739. Unless otherwise noted, LibreTexts content is licensed by
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