Shield volcanoes are built primarily by successive eruptions of which volcanic material?

Question

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Shield volcanoes are typically built from the repeated eruptions of mafic lava flows, which have low viscosity and can travel long distances before solidifying. This results in wide, gently sloping cones that resemble a warrior's shield. Mafic pyroclasts (choice B) and felsic lava flows (choice C) are not typically associated with shield volcanoes, while felsic pyroclasts (choice D) may be present but are not the primary building material.

Shield Volcanoes Are Built Primarily by Successive Eruptions of Which