How does this Mauna Loa sample compare with Mt. St. Helens, sample # D240067 0 a

Question

How does this Mauna Loa sample compare with Mt. St. Helens, sample # D240067 0 a. It is more silicic, more alkaline (higher Na2O and K2O), and more felsic. 0 bit is less silicic, less alkaline (lower Na20 and K2O), and more mafic. 0 c. It is more silicic, more alkaline (higher Na2O and K2O), and more mafic. Od. t is less silicic, less alaline (ower Na20 and K20), and more felsic. QUESTION 9 10 points Saved Briefly describe the general differences in chemical composition and shape of Mount St. Helens and Mauna Loa, and, digging back into your GEOL 101 memories regarding the relationship between magma composition and viscosity, speculate about the relationship between these two aspects. TTTArial Maura Loa has basalt lava that is very low in silica. The lava is extremely hot and runny, and volcano tends to produce large volumes of it when it erupts. Shield volcano and it has wide, gently sloping flanks. Mt.St. Helens : High viscosity lava flow slowly and typically cover small areas, causing stratovolcanos that explode violently due to trapped gas. And it contained 64% silica and about 4% water. Path: p Words:69

Explanation / Answer

answer to the 1st is option b. The errupted lava of mouna loa has a low amount of silica. It has less alkaline and it is more mafic.Silica-poor magma flows more easily and creates less explosive eruptions,and less explosive eruption is called mafic which can be found in mouna loa volcanoes. But on the other hand st helens volcano is too explosive that is called felsic and that is high silica included. Hence the answer is it is less silicic,less alkaline(lower Na2O and K2O) and more mafic.

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