Final answer:
The Hawaiian Islands are made up of basalt, which is an igneous rock formed through volcanic activity.
Step-by-step explanation:
The Hawaiian Islands are made up of igneous rocks formed through volcanic activity. The type of igneous rock found in the Hawaiian Islands is called basalt. Basalt is a dark-colored, fine-grained rock that forms when lava cools quickly on the surface of the Earth. It is commonly found in volcanic regions and is rich in minerals like olivine and pyroxene.
Learn more about Hawaiian Islands and igneous rocks