In the past the area between Java and Sumatra is the sea. Later, when about 1 000,,000 years ago, earth this area to split. Result in the magma and elemental concentration of generated. And it shall come to pass, magma has cooled down to catch the underwater mountain tens of thousands of years later, the volcano started เย็นตัว elements.And it was continued until the island out of the water accumulation become large with Java and Sumatra, but a nearby island is not strong, gradually wear away. That left only the strong. A small island several islands.
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