Question

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

Answer 1

Ryukyu Islands, also called Nansei Islands, Japanese Ryūkyū-Shotō, or Nansei-Shotō, Ryukyuan Okinawa, archipelago, extending some 700 miles (1,100 km) southwestward from the southern Japanese island of Kyushu to northeastern Taiwan. The archipelago defines the boundary between the East China Sea (west) and the Philippine Sea (east). With a total land area of 1,193 square miles (3,090 square km), the Ryukyus consist of 55 islands and islets divided into three major groups: the Amami island chain in the north, the central Okinawa islands, and the Sakishima islands in the south. Administratively, the Ryukyus are part of Japan, the Amami group constituting a southern extension of Kyushu’s Kagoshima prefecture (ken) and the Okinawa and Sakishima islands making up Okinawaprefecture.
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Answer 2

Answer:

After 1429, Shō Hashi unified Okinawa Island, founding the Ryukyu Kingdom. During the 1430s and 1440s, Ryukyu expanded into the Amami Islands. By 1450, Ryukyuan forces had reached deep into the Tokara Islands and conquered all but Kikai Island, which was invaded in 1466.

Explanation:

Islands can also be formed when continental plates collide. When they collide they push land up creating an underwater mountain that goes above land. This land, when surrounded by water, is called an island. Another way an island landform can be made is through deposits of sand that came from erosion