What type of volcanic rock does Fernandina have?

Fernandina Island, part of the Galápagos archipelago, primarily features basaltic rock, which is typical of shield volcanoes. This rock type is formed from low-viscosity lava that flows easily, creating broad, gently sloping volcanic structures. The basalt on Fernandina is often dark in color and rich in iron and magnesium, resulting from the island's relatively recent volcanic activity.