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

Question

Quizplus · Accepted Answer

Stratovolcanoes have relatively steep sides because their magma has moderate viscosity, which means the lava flows are not very fluid. This causes the lava to solidify relatively quickly after it erupts, preventing it from flowing far and thus building up steep slopes.

Stratovolcanoes Have Relatively Steep Sides Because ____