Hawaiian volcanoes are primarily shield volcanoes formed by the eruption of low-viscosity lava that flows easily across the landscape. This type of volcano creates broad, gently sloping mountains. The most famous of these is Mauna Loa, which is one of the largest volcanoes on Earth by volume. The Hawaiian Islands were formed by volcanic activity over millions of years as the Pacific Plate moved over a stationary hotspot in the Earth's mantle. Kilauea is another well-known volcano in Hawaii, known for its frequent eruptions and active lava flows, making it one of the most active volcanoes in the world.