Which of the following is likely to be true about the magma that formed the left volcanic feature compared to the right one in this figure?
A)the magma has a higher viscosity
B)the magma has a higher silicate content
C)the magma is probably more felsic
D)all of these

Question

Which of the following is likely to be true about the magma that formed the left volcanic feature compared to the right one in this figure? 
A)the magma has a higher viscosity 
B)the magma has a higher silicate content 
C)the magma is probably more felsic 
D)all of these

Quizplus · Accepted Answer

Both volcanic features have different shapes, indicating differences in viscosity and gas content. The left feature has a steeper slope that suggests a higher viscosity. Higher viscosity magma tends to have a higher silicate content and is more felsic in composition, indicating that all three statements are likely true. Therefore, choice D is the best answer.

Which of the Following Is Likely to Be True About