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.)
Look at the following volcanoes (note that the maps are of several different scales):
• Mount Vsevidof (53°07'35"N, 168°41'16"W), a composite volcano in Alaska (shown on Map T-2, Map T-21b, and Figure 34-2)
• Crater Mountain (37°52'42"N, 119°00'25"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°34'56"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 (19°28'17"N, 155°35'41"W), a large shield volcano on the Big Island of Hawai‘i (shown on Maps T-1 and T-21a)
What will be an ideal response?
The cinder cone base is undeformed by the lava flow.
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