What properties of the source magma lead to the formation of a shield volcano?
A)low viscosity and mafic composition
B)high viscosity and felsic composition
C)any magma composition so long as it contains a large portion of dissolved volatiles
D)an intermediate composition magma that encounters seawater in the magma chamber

Question

Quizplus · Accepted Answer

Shield volcanoes form from low viscosity magma, meaning it flows easily, and mafic composition, which refers to a type of magma that contains high amounts of iron and magnesium. This type of magma allows for fluid lava flows and the gradual buildup of broad, shield-shaped volcanoes.

What Properties of the Source Magma Lead to the Formation