The basin of the Pacific Ocean consists of the large Pacific
Ocean Plate in the East, the Philippine Plate in the West and
Indonesia and the Oceania Plate.
Due to plate tectonics, ridges and valleys have been formed,
with sustained volcanic activities and earthquakes. Basalt from
the eruptions of underwater volcanoes piled up to create many
volcanic islands. There are many active volcanoes in the Pacific
Ring. For islanders of the Pacific Ocean, coral islands or shore
reefs formed by lime provide important materials for their daily
Oceania means land in the Pacific Ocean. It is believed to consist of more than 10,000 islands. It can be divided into Polynesia, Melanesia and Micronesia. The total area is about one million square kilometers, mainly located between the Tropic of Cancer and the Tropic of Capricorn. Because it is located in the Tropical Zone, the weather is very humid and hot. Many islands are not inhabited. Oceania, in a broad sense, includes Australia and New Zealand.