Bonin Islands Pacific Plate is subducting under the Philippine Sea Plate, which creates an oceanic trench to the east of the islands: the Bonin Trench. The crust of the Ogasawara Islands was formed by volcanic activity when subduction began 45–50 million years ago, and is composed mostly of an andesitic volcanic rock called boninite, which is rich in magnesium oxide, chromium, and silicon dioxide. The Ogasawara Islands may represent the exposed parts of an ophiolite that has not yet been emplaced on oceanic crust. The rocks of the Volcano Islands are much younger; Iwo Jima is a dormant volcano characterized by rapid
Japanese expatriates in the Solomon Islands some of whom were not very fluent in Japanese. Okinawan fishermen used a simplified form of Pijin when communicating with the Solomon Islander fishermen, often incorporating Okinawan loanwords. The modified Pijin that was used by Okinawan fishermen was often criticised by Solomon Islanders, and was occasionally called a "beach language" local, informal contexts. Japanese expatriates in the Solomon Islands A small, resident expatriate community of Japanese nationals was present in Solomon Islands from the 1970s onwards. Japanese nationals in Solomon Islands are usually employees of fishing corporations that had established branch companies in the country. The majority of them are