How does a stratovolcano generate magma? Select one: a. Along diverging plate, b

Question

How does a stratovolcano generate magma? Select one: a. Along diverging plate, both plates begin to melt at its base and magma is produced. b. Along plates that pass one another, both plates begin to melt where the plates meet and magma is produced. c. When a plate subducts into the mantle, the plate begins to melt as it dives into the mantle and magma is produced. d. Huge, stationary magma plumes are generated at the lower and upper mantle boundary. If enough accumulates, magma rises up through the crust. e. When a plate subducts into the mantle, the overlying plate begins to melt at its base and magma is produced. Both stratovolcano and shield volcanoes possess a layered, internal structure. Select one: a. True b. False Shield volcanoes have more pyrodastic material compared to a stratovolcano and are thus more explosive. Select one: a. True b. False What might happen if basaltic magma mixes with a rhyolitic magma and erupted Select one: a. A low viscosity magma would be generated, less gas would be trapped and the eruption would be less explosive. b. A low viscosity magma would be generated, more gas would be trapped and the eruption would be highly explosive. c. An intermediate magma, or andesitic magma, would be generated and the eruption would be intermediate as well. d. A low viscosity magma would be generated, more gas would be trapped and the eruption would be less explosive.

Explanation / Answer

26) c. When plate subducts into a mantle, the plate begins to melts as it dives into the mantle and magma is generated.

27) True

28) True

29) c. An intermediate magma or andisitic magma, would be generated and the eruption would be intermediate as well.

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