Magmas with the highest percentages ( 65%)of silica are called ____.
A)mafic
B)felsic
C)intermediate
D)ultramafic
E)ultrafelsic

Question

Magmas with the highest percentages (> 65%)of silica are called ____.
A)mafic
B)felsic
C)intermediate
D)ultramafic
E)ultrafelsic

Quizplus · Accepted Answer

Magmas with high percentages of silica (SiO2) are called felsic magmas. These magmas have higher viscosity and lower temperature than mafic and ultramafic magmas, which have lower percentages of silica. Intermediate magmas have a silica content between felsic and mafic. Ultrafelsic is not a commonly used term in geology.

Magmas with the Highest Percentages (> 65%)of Silica Are Called