Stratovolcanoes have relatively steep sides because ____

a. ?they are composed of compacted ash
b. ?they are composed of strong basalt with little ash
c. ?their magma has moderate viscosity so lavas flow a short distance before cooling
d. ?their explosions are fast and catastrophically explosive
e. ?they grow slowly, as new magma pushes them higher, often without eruption


ANSWER: c

Environmental & Atmospheric Sciences

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