Lab 7 -PlateTectonics_activity done .docx

Lab 7 – Plate tectonics GEOL 1121 Name …. This lab covers the mechanisms of plate tectonics and the resulting landforms and events we see and feel on Earth’s surface. At the end of this lab you should be able to: 1) Explain the theory of plate tectonics in your own words 2) Summarize the reasons for different plate boundary interactions and describe the resulting surface landforms and events. 3) Evaluate where on Earth’s surface we have plate boundaries and describe the processes happening at these boundaries. 4) Use current landforms on Earth’s surface to classify former plate boundaries. You should start by watching three videos on iCollege: Wegener and Continental Drift, Sea Floor Spreading Proof, and Plate Tectonics. The work your way through these questions, referring back to the videos as needed. Part 1: Plate Tectonics 1) In the above diagram, arrows denote the direction of movement of the crust and mantle, with numbers and letters above each boundary between plates. Name each numbered plate boundary, and what types of plates are involved. (15 pts) Name of the numbered plate boundary what types of plates are involved 1 Convergent Plate Boundary Oceanic-oceanic plates 2 Divergent Plate Boundary Oceanic-oceanic plates 3 Convergent Plate Boundary Oceanic-oceanic plates 4 Divergent Plate Boundary Continental-Continental Plates 5 Convergent Plate Boundary Continental-Continental Plates

Lab 7 – Plate tectonics GEOL 1121 Name …. 2) Name the lettered bathymetric (sea-floor) features in the figure above that are created by plate tectonics (2 pts) A: Subduction Trench B: Mid Oceanic Ridge 3) Describe in your own words the following plate boundaries. Where on Earth would you expect to find an example of each boundary? (6 pts) Convergent: It occurs when part of the earth’s outer shell collides into each other. When this occurs, it can lead to creations like mountains, earthquakes, and even plates sliding beneath another. Divergent: it occurs on the earth’s surface when two tectonic plates move away from each other. They create gaps/spaces/rifts on the earth’s crust. Underwater mountains tend to occur from this. Transform: It occurs when two tectonic plates slide past each other horizontally. As they slide, they have a possibility to get stuck, thus allowing for earthquakes. 4) Name two ways oceanic crust differs from continental crust? (2 pts) Oceanic crusts are thinner than continental due to the rocks they are composed of. oceanic crusts are composed with much finer-grained rocks In comparison to continental crusts that have a wide-array of rocks. 5) Thinking back to your igneous rock labs, what two elements might account for these differences? (2 pts) Magnesium and iron

Lab 7 – Plate tectonics GEOL 1121 Name …. 6) Look at the above image and answer the following questions (hint: Ma means Mega- annum, or millions of years) a. Where is the oldest oceanic crust in the Atlantic? (1 pt) ___it is near AF_____ b. Where is the youngest oceanic crust in the Atlantic? (1 pt) _it is MAR___________ c. Explain why this variation in the age of the oceanic crust exists across the Atlantic Ocean. (2 pts) It is due to the divergent boundary at MAR. the new ocean is constructed at the MAR, the divergent boundary of MAR moves It away from the MAR towards continental margins. So as a result newest crust is found at MAR, whereas it gets older as we move towards continents. d. The feature in the middle of the Atlantic Ocean is called the Mid-Atlantic Ridge. Given your responses to the above questions, is this a convergent, divergent, or transform boundary? (1 pt) it is a divergent boundary

Lab 7 – Plate tectonics GEOL 1121 Name ….

Lab 7 – Plate tectonics GEOL 1121 Name …. Earthquakes distribution

Lab 7 – Plate tectonics GEOL 1121 Name …. 8) Using the above maps of volcanos and earthquakes, answer the following questions: a. Which of the following has high concentrations of volcanos? Mark all that apply. (4 pts) ___ Eastern Atlantic Ocean _T_ Eastern Pacific Ocean _T_ Hawaii ___ Western Atlantic Ocean _T_ Western Pacific Ocean _T__ Iceland b. One of the oceans in the world is referred to as the “Ring of Fire” – which might it be and why? (4 pts) The Pacific Ocean is regarded as the ring of fire because it undergoes many active volcanoes due to the subduction zone of convergent plate boundaries c. Given your responses to the above questions, is a convergent, divergent, or transform boundary represented in locations that have volcanic activity and high concentrations of earthquakes? (2 pts) Convergent boundary

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