<Li> Wake Island (US) </Li> <P> This ocean has most of the islands in the world . There are about 25,000 islands in the Pacific Ocean . The islands entirely within the Pacific Ocean can be divided into three main groups known as Micronesia, Melanesia and Polynesia . Micronesia, which lies north of the equator and west of the International Date Line, includes the Mariana Islands in the northwest, the Caroline Islands in the center, the Marshall Islands to the west and the islands of Kiribati in the southeast . </P> <P> Melanesia, to the southwest, includes New Guinea, the world's second largest island after Greenland and by far the largest of the Pacific islands . The other main Melanesian groups from north to south are the Bismarck Archipelago, the Solomon Islands, Santa Cruz, Vanuatu, Fiji and New Caledonia . </P> <P> The largest area, Polynesia, stretching from Hawaii in the north to New Zealand in the south, also encompasses Tuvalu, Tokelau, Samoa, Tonga and the Kermadec Islands to the west, the Cook Islands, Society Islands and Austral Islands in the center, and the Marquesas Islands, Tuamotu, Mangareva Islands, and Easter Island to the east . </P>

How many times greater is the volume of water in the pacific ocean than in the atlantic ocean