An ophiolite is:

A) a sliced-off piece of oceanic crust that has been thrust onto the edge of a continent or island
B) a mineral consisting of basalt and gabbro formed in the mantle
C) a mixture of mafic and felsic magma within pillow basalts

Ophiolite

A section of the Earth's oceanic crust and the underlying upper mantle that has been uplifted and exposed above sea level.

Oceanic Crust

The part of the Earth's crust that underlies the ocean basins, composed mostly of basalt and thinner than continental crust.

Continental Crust

The relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than oceanic crust.