Question

Classify rocks on the basis of silica contents

Answer 1

Answer:

• In a widely accepted silica-content classification scheme, rocks with more than 65 percent silica are called felsic.
• those with between 55 and 65 percent silica are intermediate; those with between 45 and 55 percent silica are mafic.
• And those with less than 45 percent are ultramafic.