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Oceania ecozone : ウィキペディア英語版 | Oceania ecozone
Oceania is one of the WWF ecozones, and unique in not including any continental land mass. The ecozone includes the Pacific Ocean islands of Micronesia, the Fijian Islands, and most of Polynesia (with the exception of New Zealand). New Zealand and most of Melanesia, including New Guinea, Vanuatu, the Solomon Islands, and New Caledonia, are included with Australia in the Australasia ecozone. Oceania is the smallest in land area of any of the ecozones. ==Geology== ''Oceania'', is geologically the youngest ecozone. While other ecozones include old continental land masses or fragments of continents, Oceania is composed mostly of volcanic high islands and coral atolls that arose from the sea in geologically recent times, many of them in the Pleistocene. They were created either by hotspot volcanism, or as island arcs pushed upward by the collision and subduction of tectonic plates. The islands range from tiny islets, sea stacks and coral atolls to large mountainous islands, like Hawaii and Fiji.
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