EXERCISE 34 PROBLEMS-PART III Look at the following volcanoes (note that the map
ID: 294787 • Letter: E
Question
EXERCISE 34 PROBLEMS-PART III Look at the following volcanoes (note that the maps are of several different scales) Mount Vsevidof (53°0735"N, 16841'16"W), a composite volcano in Alaska (shown on Map T-2, Map T-21b, and Figure 34-2) Crater Mountain (37°52'42"N, 119900'25"W), the highest peak of the Mono Craters, a chain of rhyolitic plug dome volcanoes in California (shown on Maps T-23a and T-23c) SP Mountain (35°3456"N, 111°37'55"W), a basaltic cinder cone in Arizona (shown on Maps T-22a and T-22b and Figure 34-3) . Mauna Loa (1928, 17"N, 155,541"W), a large shield volcano on the Big Island of Hawai'i (shown on Maps T-1 and T-2la) Why are the summits of Mount Vsevidof and Crater Mountain so different? (Hint:Contrast the formation of each.) 1. 2. What indicates that the lava flows associated with Crater Mountain (and the other Mono Craters) were viscous? 3. What indicates that the lava that flowed north from SP Mountain was very fluid? 4. Some geologists think that the large lava flow to the north of SP Mountain occurred before the final formation of the SP Mountain cinder cone itself. What evidence that you can see supports this conclusion? (Hint: Think about the structure, and so the relative strength, of a cinder cone.) 5. (a) Did all of the lava flows associated with Mauna Loa originate at the top of the volcano? (b) How do you know? 6. What is the relationship of lava flows on Mauna Loa to the "Rift Zones" along the slopes of the volcano?Explanation / Answer
1) Mt. Vsevidof has much smoother, more symmetrical cone shape and a summit crater. Pyroclastics ejected by Mt. Vsevidof help form the symmetrical cone.
2) By analysing the thickness of lava flow that is by comparing the elevation of the bottom and top of the lava flow edge to determine its thickness I concluded that the rhyolitic lava from Crater Mountain was very thick that means lava flow was viscous.
3) By analysing the thickness of lava flow that is by comparing the elevation of the bottom and top of the lava flow edge to determine its thickness I concluded that the basaltic lava from SP Mountain was comparatively thin that means lava flow was very fluid.
4) Skipped as per demand.
5) a) No, all the lava flows associated with Mauna Loa don't originate at the top of the volcano.
b) Aerial view of Mauna Loa eruption tells that eruption has taken place from a fissure across the rim and floor of Moku‘?weoweo Crater at the volcano's summit.
6) Summit area of Mauna Loa, includes Moku‘?weoweo Caldera at 12000 ft and the uppermost parts of the two rift zones. Northeast and southwest rift zones are present below that elevation and the southeast and north and west flanks. Around 33 radial vents were found on the north and west sectors of the volcano, which signifies lava can erupt from these sectors of the volcano in addition to the rift zones and summit area.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.