Basaltic lavas form shield volcanoes and flood basalts rather than steep stratovolcanoes because:
a. low silica results in high-viscosity, pasty lava.
b. low silica results in low-viscosity, fluid lava.
c. high silica results in high-viscosity, fluid magma.
d. high silica results in low-viscosity, fluid lava.
Answer: C