Question: The most common type of rock in earth's crust is?

context: Mafic is an adjective describing a silicate mineral or igneous rock that is rich in magnesium and iron, and is thus a portmanteau of magnesium and ferric. Most mafic minerals are dark in color, and common rock-forming mafic minerals include olivine, pyroxene, amphibole, and biotite. Common mafic rocks include basalt, diabase and gabbro. Mafic rocks often also contain calcium-rich varieties of plagioclase feldspar.
question: The most common type of rock in the earth's oceanic crust is?
short_answers: Mafic rocks
basalt, diabase, and gabbro
context: Felsic rocks are usually light in color and have specific gravities less than 3. The most common felsic rock is granite. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich).
question: The most common type of rock in the earth's continential crust is?
short_answers: granite
felsic rocks

Answer: The Earth's crust is of two distinct types, oceanic and continental, with different rocks the most common in each. The most common type of rock in the oceanic crust is mafic rock, igneous rock that is rich in magnesium and iron. Common mafic rocks include basalt, diabase, and gabbro. The most common type in the continental crust are felsic rocks, igneous rocks relatively rich in elements that form feldspar and quartz, the most common of which is granite.