The Okinawa and Amami Great Island are the biggest among the Ryukyu Islands. How were these bigger islands created?

Answer 1

The Ryukyu Islands were formed through a process of volcanic activity, tectonic plate movements, and coral reef growth over millions of years. The Okinawa and Amami Great Island are believed to have been formed primarily through volcanic activity, with a series of volcanic eruptions and lava flows gradually building up the land mass over time. The islands also contain limestone and coral formations, which were created by the gradual deposition of calcium carbonate by marine organisms such as corals and plankton. Over time, these processes led to the formation of the larger islands that we see today.