Gabbro is coarser than basalt because
A) The magma that formed the gabbro cooled slower than the basalt magma.
B) Gabbro has contact metamorphism whereas basalt does not.
C) Gabbro contains much more silica than basalt.
D) Higher pressure formed the gabbro.

Question

Quizplus · Accepted Answer

Gabbro is coarser than basalt because it forms from magma that cools slowly beneath the Earth's surface, allowing larger crystals to develop, whereas basalt forms from magma that cools quickly at or near the surface, resulting in finer crystals.

Gabbro Is Coarser Than Basalt Because