Context: This is a piece of gabbro. It formed through the cooling of melted rock below the earth's surface, called magma.
As the magma cooled, mineral grains began to form. Gabbro is made of minerals such as olivine and feldspar. The mineral grains in gabbro are large. This is because the magma cooled slowly.
What type of rock is gabbro?
A. sedimentary
B. igneous
C. metamorphic
From the given choices, choose the correct answer and respond with the letter of that choice.

B