ERTH 1050 Google earth HW 2

Part 1 1. Determine the slope angle of this volcano by doing the following (use feet as the length unit for all answers): A.) (0.1 points) Determine the elevations of the two Problem 1 place markers. Then calculate and state the relief (vertical distance) as the difference between these two elevation measurements. 12,903 - 8,462 = 4,441 relief B.) (0.1 points) Use the Ruler tool to measure the horizontal distance between the two Problem 1 place markers. 28,055.40 ft C.) (0.1 points) Calculate the angle of the slope between the two place markers using the following equation: slope angle = tan -1 (relief/horizontal distance) Was 8.99 but can be rounded to 9.00 degrees 2. A.) (0.1 points) Which of the three lava flows is the oldest? Which one is the youngest? Oldest: Problem 2A just because it looks like it has been weathered and lighter Youngest: Problem 2C just because it looks darker and more fresh B.) (0.2 points) Pretty much all the solidified lava you see near Kilauea and Mauna Loa is basalt. Using just the satellite imagery, how would you know that these lavas are basaltic (as opposed to andesitic or rhyolitic)? Use the information in textbook sections 4.4 and 5.3. Limit your answer to one or two complete sentences. You can tell these lavas are basaltic by the coloring because since basalt is a fine-grained mafic rock, it appears black/ dark grey, and Basaltic lava has low viscosity and thus can flow long distances. You can see this long flow all the way into problem 2C. 3. Determine the slope angle of this volcano by the same steps as you did at Mauna Loa: A.) (0.1 points) Determine the elevations of the two Problem 7 place markers. Then calculate and state the relief (vertical distance) as the difference between these two elevation measurements. 8,100 - 3,517 = 4,583 relief B.) (0.1 points) Use the Ruler tool to measure the horizontal distance between the two Problem 7 place markers. 14,408.78 ft C.) (0.1 points) Calculate the angle of the slope between the two place markers using the same equation you used before. State your slope angle in degrees (do not use radians). 17.64 degrees D.) (0.2 points) Uncheck the box next to Mt. Saint Helens Contour Map . Zoom in to look at the ground near the volcano’s peak (ignore any white patches of snow/ice). What is the igneous rock type you see, and how can you tell using satellite imagery? Use the information in textbook sections 4.4 and 5.3. Limit your answer to one or two complete sentences. In textbook 5.3, Mt St Helens has 1 km3 (amounts of pyroclastic debris) making it an explosive stratovolcano. In these conditions, andesite is more likely to be found in stratovolcanoes vs. basalt being in shield volcanoes like Hawaii. E.) (0.3 points) Using the slope angles of Mauna Loa and Mt. Saint Helens and the compositions of the lavas that erupted from these two volcanoes. How does volcano shape relate to lava composition (i.e., silica content) and how do these characteristics relate to the viscosity and explosivity of the two volcanoes? Textbook section 5.3 provides the information needed to answer this question. Mt St Helens: Strato volcano, high viscosity, more explosive & vicious Mauna Loa: Shield volcano, low viscosity, effusive eruption Part 2 4. Consider the topography of the Grand Canyon by doing the following: A.) (0.1 points) Determine the elevations of the two Problem 2 place markers. Do this by placing your mouse cursor directly over each of the place markers then take note of the “elev” value as it appears in