Final answer:
Based on their composition and texture, igneous rocks are categorized. Granitic rocks are felsic, while basaltic rocks are mafic. Ultramafic rocks have even lower silica content, and intermediate rocks have a silica content between granitic and basaltic.
Step-by-step explanation:
The classification of igneous rocks is based on chemistry and texture. Chemistry determines the minerals that form in the rock, while texture is determined by the cooling rate. Slow cooling results in coarse-grained rocks, while fast cooling produces fine-grained rocks. Based on the given options, if a rock is granitic, it means it has a high silica content and is therefore felsic. If a rock is basaltic, it means it has a low silica content and is mafic. If it's ultramafic, it has even lower silica content, and if it's intermediate, it has a silica content between granitic and basaltic.