Question

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question: ____ accumulating inside the vent can cause an explosive eruption from a shield volcano.

Explanation:

Shield volcanoes typically have low - viscosity, basaltic magma. But when gas (such as water vapor, carbon dioxide, etc.) accumulates inside the vent, it can increase the pressure significantly. As the pressure builds up, it can lead to an explosive eruption even in a shield volcano. The main factor that can cause an explosive eruption in a shield volcano when accumulating in the vent is gas (or more specifically, volatile substances like dissolved gases in the magma).

Answer:

Gas (or Volatiles)