The islands of Oceania consist entirely of volcanic islands and coral reefs, showcasing a majestic natural landscape shaped by unique evolutionary processes. Mauna Kea in Hawaii stands at an elevation of 4,205 meters, but if measured from the ocean floor, it ranks as the tallest peak in the world. Like the Izu Islands, Hawaii Island is formed from basaltic lava, and lava flows are still active today, allowing the island to continue growing. In western Australia, the Jack Hills contain rocks dating back 4.4 billion years, representing the oldest known crust on Earth's surface. There is also a prominent theory that the first life on Earth, a type of bacteria, originated in Australia. Uluru (Ayers Rock), a massive sandstone monolith standing 868 meters tall, appears red due to iron oxidation.