Geology of Indonesia active volcanoes formed Sumatra, Java, Bali, and Nusa Tenggara islands, most of which, particularly Java and Bali, emerged within the last 2–3 million years. The Pacific and Australian plate movements controlled the tectonics of the eastern portion of Indonesia. The tectonics processes in Indonesia formed major structures in Indonesia. The most prominent fault in the west of Indonesia is the Semangko Fault or the Great Sumatran Fault, a dextral strike-slip fault along Sumatra Island (about 1900 km). The formation of this fault zone is related to the subduction zone in the west of Sumatra. Palu-Koro fault is another major structural
Indonesia million by 2050. Around 8 million Indonesians live overseas, with most of them settled in Malaysia, Netherlands, Saudi Arabia, United Arab Emirates, Hong Kong, Singapore, United States, and Australia. Indonesia is a very ethnically diverse country, with around 300 distinct native ethnic groups. Most Indonesians descend from Austronesian-speaking peoples whose languages can be traced to Proto-Austronesian, which possibly originated in what is now Taiwan. Another major grouping are the Melanesians, who inhabit eastern Indonesia (Maluku Islands and Western New Guinea). The Javanese are the largest ethnic group, comprising 40.2% of the population. They are predominantly located in the central to