Final answer:
The island of Hawai'i features five active subaerial volcanoes formed by the Hawaii hotspot, including two of the most active volcanoes, Mount Kilauea and Mauna Loa, and two dormant ones, Mauna Kea and Hualālai.
Step-by-step explanation:
The island of Hawai'i is composed of five active subaerial volcanoes.
The Hawaii hot spot supplies the heat to maintain these active volcanoes, which include Mount Kilauea, one of the most active volcanoes in the world, and Mauna Loa. Additionally, there are two dormant volcanoes on the island, Mauna Kea and Hualālai. The Hawaiian island chain has been formed over millions of years as the Pacific Plate moved over the Hawaii hotspot, resulting in a chain of volcanic islands, starting from the currently active island of Hawai'i to the oldest island of Kauai.