Lab 1 – Geotours Worksheet B – Plate Tectonics_ 1241_ON_GEOL101_12334

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5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 1/9 Lab 1 – Geotours Worksheet B – Plate Tectonics Due Feb 2 at 11:59pm Points 20 Questions 20 Available Jan 16 at 12pm - Feb 2 at 11:59pm Time Limit 30 Minutes Allowed Attempts 2 Instructions This quiz was locked Feb 2 at 11:59pm. Attempt History Attempt Time Score LATEST Attempt 1 30 minutes 20 out of 20  Answers will be shown after your last attempt Score for this attempt: 20 out of 20 Submitted Jan 22 at 4:49pm This attempt took 30 minutes.  Question 1 1 / 1 pts both are moving west Correct Problem 17-north is moving east, Problem 17-south is moving west This lab quiz is made up of questions from the Geotours Workbook activity listed in the title. After you have completed this worksheet, answer the following quiz questions. Do not attempt the quiz until you have completed the Lab. This quiz is made up of multiple choice questions for a total of 20 points possible on the quiz. You must complete this quiz after you start it. You cannot save the quiz and return to complete it later. You will have 30 minutes to complete the quiz. If you miss a question, you will be able to see the question you missed and the answer you submitted. You will not see the correct answer. Looking up the correct answer makes quizzes a valuable study tool for students. You will have 2 attempts available, but different questions on the same topics may appear on each attempt. The highest score will count toward your grade. A017) Transform Boundary - Mid-Atlantic Ridge. Which direction are the placemarks for Problem 17-north and Problem 17-south moving, respectively? Think about the process of rifting at the mid-ocean ridges.

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 2/9 both are moving east Problem 17-north is moving west, Problem 17-south is moving east  Question 2 1 / 1 pts subducting slabs must reach a depth of 51-100 km before they produce volcanic arcs subducting slabs must reach a depth of 101-200 km before they produce volcanic arcs Correct the subducting slab has a steeper angle of descent for the larger arc-trench gap (Tonga) than for the smaller arc- trench gap (Nazca) arc-trench gaps are essentially the same distance for all subduction systems around the world  Question 3 1 / 1 pts left-lateral (at the fault, you turn left to find the offset wash segment) right-lateral (at the fault, you turn right to find the offset wash segment) Correct  Question 4 1 / 1 pts both are moving east Problem 16-north is moving east, Problem 16-south is moving west Correct Problem 16-north is moving west, Problem 16-south is moving east both are moving west  A013) Convergent Boundary - Tonga Trench & Nazca Trench. Assume that the earthquake depths define the Wadati-Benioff zone for the subducting slab. Compare your answers to Problems 9-12 and choose the statement that best describes your observations. A018) Transform Boundary - San Andreas Fault, CA. Check and double-click the Problem 18 folder to see a drywash (blue line) that was offset by the San Andreas Fault. What type of transform fault is the San Andreas Fault? Imagine walking toward the fault zone along the offset feature, and think about which direction you would look to see the other piece of the offset feature. A016) Transform Boundary - Mid-Atlantic Ridge. Which direction are the placemarks for Problem 16-north and Problem 16-south moving, respectively? Think about the process of rifting at the mid-ocean ridges.

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 3/9 Question 5 1 / 1 pts ~125 Ma ~150 Ma ~43 Ma Correct ~32 Ma  Question 6 1 / 1 pts ~4.2 cm per year ~8.8 cm per year Correct ~1.9 cm per year ~15 cm per year  Question 7 1 / 1 pts A020) Oceanic Hot Spots - Hawaiian Island–Emperor Seamount Chain. What is the approximate age of the bend in the Hawaiian Island–Emperor Seamount hot-spot chain ( should you use the age of the volcanic features or the age of the seaﬂoor)? A019) Check the box next to the Seaﬂoor Age Map folder to view the ages of the oceanic crust around the world. Note that you can select the folder and use the transparency slider at the bottom of the Places panel to make the items in this folder semi-transparent. Turn on the Tectonic Plates folder (divergent = red, convergent = green, and transform = light blue). Also, in the Layers panel, turn on Borders and Labels and Gallery > Volcanoes . Oceanic Hot Spots - Hawaiian Island–Emperor Seamount Chain. Make the Seaﬂoor Age Map semi-transparent, and turn on the Hawaiian Island–Emperor Seamount Chain folder to show their age of formation in millions of years (Ma). Use the Ruler tool to measure the distance between Midway Atoll and Kilauea (cm; Problem 19 placemarks) and calculate the average velocity of the Pacific Plate in cm per year. A001) Worksheet Resources Google Earth - Open the 2. Exploring Geology Using Geotours > B. Plate Tectonics folder. Problem Materials - Check and double-click items associated with each problem to travel to the appropriate location with the prescribed perspective/zoom. Plate Tectonics Geotours Library - Explore additional Geotours in this folder to help answer problems. Geoscience - Consult a textbook and/or Internet resources to help answer some problems.

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5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 4/9 ~3300 km ~2700 km ~7400 km ~5300 km Correct  Question 8 1 / 1 pts 4.4 cm per year Correct 44.0 cm per year 5.8 cm per year 7.5 cm per year  Question 9 1 / 1 pts Check the box next to the Seaﬂoor Age Map folder to view the ages of the oceanic crust around the world. Note that you can select the folder and use the transparency slider at the bottom of the Places panel to make the items in this folder semi-transparent. Check and double-click the Africa & South America placemarks to ﬂy to their positions on the opposite sides of the Atlantic Ocean. These placemarks represent conjugate points (locations on the opposite sides of an ocean that were once adjacent before seaﬂoor spreading occurred). These points are located on the boundary between the continental shelf and the continental slope . Although the fit between the African and South American coastlines had been recognized for some time, Wegener showed that carefully matching continental shelves improves this fit. Seaﬂoor Spreading - Atlantic Ocean. Use the Ruler tool to determine how far these points have moved apart (in km). Select the Path tab on the Ruler tool and then create segments along the major fracture zone that offsets the colored ages of the ocean ﬂoor (round to the nearest 1000 km). A004) Seaﬂoor Spreading - Atlantic Ocean. Express your average spreading rate answer for Problem 3 in terms of cm per year. Note– If the plates are moving apart symmetrically at the same rate (i.e., the color band widths are approximately equal), then 1/2 of this answer is the average rate at which the South American plate is moving west and the African plate is moving east.

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 5/9 the ENE-trending Gulf of Aden is a linear sea that is opening in a NNE-SSW direction the NW-trending Red Sea is a linear sea that is opening in a NE-SW direction the volcanoes in Africa define a volcanic arc related to subduction off Africa’s east coast Correct the volcanoes in Africa define a narrow linear rift that is opening in a NW-SE direction  Question 10 1 / 1 pts ~4.2 cm per year Correct ~8.8 cm per year ~1.9 cm per year ~15 cm per year  Question 11 1 / 1 pts ~75 km per million years ~44 km per million years Correct ~83 km per million years ~58 km per million years A007) Divergent Boundary Triple Junction - Afar Triple Junction, Eastern Africa. In the Layers panel, turn on Borders and Labels and also Gallery > Volcanoes , then double-click on the Problem 7 placemark. Divergent boundaries often begin as triple junctions composed of three rift "arms" at ~120° apart (which may or may not evolve into divergent boundaries). Knowing that rifts (red lines) generally open perpendicular to the rift (or sub- parallel to the light blue transform faults), which of the statements below about this area is incorrect? A021) Check the box next to the Yellowstone Hot-Spot Trail folder to view the locations and ages of the main calderas that formed in association with the Yellowstone continental hot spot over the past 16.5 Ma. Note that you can select the folder and use the transparency slider at the bottom of the Places panel to make the items in this folder semi-transparent. Continental Hot Spots - Yellowstone Hot-Spot Trail. Use the Path tab on the Ruler tool to measure the distance between the Problem 21 placemarks (cm) along the hot-spot trail. Calculate the average velocity of the North American Plate in cm per year using 16.5 Ma and 0.63 Ma for the two placemarks. A003) Seaﬂoor Spreading - Atlantic Ocean. Using the largest number of the range for your answer to Problem 2 and using the distance for your answer to Problem 1, calculate the average spreading rate for these points in km per million years.

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 6/9  Question 12 1 / 1 pts east side Correct west side both are spreading at approximately the same rate  Question 13 1 / 1 pts ~190 km ~245 km ~295 km Correct ~401 km  Question 14 1 / 1 pts 101-200 km Correct 201-400 km 0-50 km 51-100 km  Question 15 1 / 1 pts A006) Divergent Boundary Spreading Rates - East Pacific Rise. Some divergent boundaries spread at different rates. Use the widths of the color bands (marked by the Problem 6 placemarks) representing seaﬂoor ages on either side of this mid-ocean ridge to determine which side is moving faster. A012) Convergent Boundary - Nazca Trench. Use the Ruler tool to determine the arc-trench gap (in km) between the placemarks. A009) Convergent Boundary - Tonga Trench. Subduction ultimately produces a volcanic arc on the overriding plate. What is the depth of the majority of earthquakes directly beneath the volcanic arc associated with the Tonga Trench? A022) Continental Hot Spots - Hawaiian Island–Emperor Seamount Chain & Yellowstone Hot-Spot Trail. Which of the following best describes the present-day direction and rate of motion of both the Pacific Plate and the

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5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 7/9 Pacific Plate moves SE at about half the rate of the NE-moving North American Plate Pacific Plate moves NW at about twice the rate of the SW-moving North American Plate Correct Pacific Plate moves SE at about twice the rate of the SW-moving North American Plate Pacific Plate moves NW at about the same rate of the NE-moving North American Plate  Question 16 1 / 1 pts both are spreading at approximately the same rate Problem 2a-Pacific Correct Problem 2a-Atlantic  Question 17 1 / 1 pts all three are along an active transform fault North American Plate (refer to Problems 19 & 21)? Think about the analogy of a piece of paper passing over a candle. A005) Check the box next to the Seaﬂoor Age Map folder to view the ages of the oceanic crust around the world. Note that you can select the folder and use the transparency slider at the bottom of the Places panel to make the items in this folder semi-transparent. Also, turn on the Tectonic Plates folder. Divergent = red, convergent = green, and transform = light blue. Divergent Boundaries - Mid-Atlantic Ridge vs East Pacific Rise. The Problem 5 placemarks lie on the crests of mid-ocean ridges ( divergent boundaries ) in the Atlantic and Pacific Oceans, respectively. Double-click each placemark and use the width of the color bands representing seaﬂoor ages to determine which divergent boundary is spreading at a faster rate. A015) Check the box next to the Seaﬂoor Age Map folder to view the ages of the oceanic crust around the world. Note that you can select the folder and use the transparency slider at the bottom of the Places panel to make the items in this folder semi-transparent . Turn on the Tectonic Plates folder (divergent = red, convergent = green, and transform = light blue). Also, in the Layers panel, turn on Borders and Labels and Gallery > Earthquakes . Transform Boundary - Mid-Atlantic Ridge. These placemarks point to a segment of either an active transform fault or an inactive fracture zone ( see the transform boundary section of your textbook) . Which of the following statements is correct?

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 8/9 Problem 15-west and Problem 15-middle are inactive fracture zones, and Problem 15-east is an active transform fault Problem 15-west and Problem 15-east are inactive fracture zones, and Problem 15-middle is an active transform fault Correct Problem 15-west and Problem 15-east are active transform faults, and Problem 15-middle is an inactive fracture zone  Question 18 1 / 1 pts the line of volcanoes west of the Tonga Trench is the volcanic arc subducting plate is to the east and overriding plate is to the west subducting plate is to the west and overriding plate is to the east Correct earthquakes generally become deeper to the west  Question 19 1 / 1 pts ~115-120 mya Correct ~55-60 mya ~35-40 mya A008) Check the boxes next to the Tectonic Plates and Earthquakes folders to view the tectonic plate boundaries (divergent = red, convergent = green, and transform = light blue) and to view selected 1986-2005 earthquakes color-coded by depth, respectively. Also, in the Layers panel, turn on Borders and Labels and Gallery > Volcanoes . Turn off the Seaﬂoor Age Map folder. Convergent Boundary - Tonga Trench. Check and double-click the Problem 8 placemark to ﬂy to the Tonga Trench. Which of the following is incorrect (think about where volcanoes form in association with a subduction zone)? A002) Seaﬂoor Spreading - Atlantic Ocean. Using the Seaﬂoor Age Map , about how many millions of years ago (mya) were these points once adjacent? Note that the continental shelf and slope are not covered by the Seaﬂoor Age Map as they are not composed of oceanic crust, so use the colored age band highlighted by the Problem 2 placemark (count the black isochron lines).

5/5/24, 9:42 PM Lab 1 – Geotours Worksheet B – Plate Tectonics: 1241_ON_GEOL101_12334 https://mcckc.instructure.com/courses/13336/quizzes/106054?module_item_id=897247 9/9 ~175-180 mya  Question 20 1 / 1 pts ~190 km Correct ~401 km ~245 km ~295 km Quiz Score: 20 out of 20 A010) Convergent Boundary - Tonga Trench. Use the Ruler tool to determine the arc-trench gap (in km) between the placemarks.

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