6. tend to increase the explosive potential of a magma body beneath a volcano by

Question

6. tend to increase the explosive potential of a magma body beneath a volcano by the greatest amount. A. High viscosity and lots of dissolved gas B. High viscosity and very low levels of dissolved gas C. Low viscosity and lots of dissolved gas D. Low viscosity and very low levels of dissolved gas -7. A volcanic island arc is the result of ic crust A. subduction of continental crust underneath ocean B. subduction of oceanic crust underneath oceanic crust C. subduction of continental crust underneath continental crust D. subduction of oceanic crust underneath continental crust 8. Magma tends to rise toward Earth's surface principally because_-_-. A. water is an abundant constituent of magma B. silica increases the viscosity of the magma C. rocks become less dense when they melt D. of convection in the mantle 9, which of the following best describes Shiprock, a famous volcanic feature in New Mexico? A. a very recently active, basaltic cinder cone B. the eroded remains of a volcanic neck and radiating dikes C. an extinct, massive, rhyolitic shield volcano D. an extinct, highly symmetrical, composite volcanic cone 10. How do calderas form? A. collapse of a partially emptied magma chamber B. explosive eruption carving out a big hole in the ground C. impact of a meteorite D. erosion by lava flows 11. Mauna Loa, a volcano in Hawaii, is an excellent example of a A. shield volcano B. cinder cone C. composite volcano D. volcanic neck 12. Mt. St. Helens, a volcano in Cascade Range, is an excellent example of a A. shield volcano B. cinder cone C. composite volcano D. volcanic neck

Explanation / Answer

Question 6
Answer: A. High viscosity and lots of dissolved gas
High viscosity and lots of dissolved gas tend to increase the explosive potential of a magma body beneath a volcano by the greatest amount. If magma has high viscosity with lots of gases then there will be very hard to escapes the gases through magma. So there will violent explosion occurred.
Question 7
Answer: B Subduction of oceanic crust underneath oceanic crust.
Question 8
Answer: c. rocks become less dense when they melt.

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