What magma properties would most likely 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 are characterized by broad, gently sloping sides and are typically formed by low viscosity basaltic magma. Mafic magma is rich in iron and magnesium and has a low viscosity, allowing it to flow easily and form broad, flat lava flows instead of steep, explosive eruptions.

What Magma Properties Would Most Likely Lead to the Formation