Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Igneous rocks are classified by composition and texture. The composition can be felsic, intermediate, mafic, or ultramafic. The composition depends on the minerals the rock includes. A felsic rock will contain felsic minerals. Answer: igneous
Solution:
Felsic, intermediate, mafic, and ultramafic are types of composition of what rock group?