Check your chapter knowledge with an on-line quiz.

Glencoe Earth Science : Chapter 5 - Igneous Rocks 9.) What is the difference between gabbro and basalt?     A.)  Gabbro is felsic and basalt is mafic.     B.)  Gabbro is coarse grained and basalt is fine grained.     C.)  Gabbro is fine grained and basalt is coarse grained.     D.)  Gabbro has a glassy texture and basalt has a fine-grained texture.