Answer:
it's called Continental Drift!
what you said it's fails
Answer: Formation of Iceberg
Explanation: A glacier is a very large mass of ice formed overtime by the compression of snowfall. Glacier are formed in very high altitudes and very cold parts of the Earth.
When a glaciar is exposed to ocean currents: it can break to form icebergs which are large mass of floating ice. This is breaking of glaciers is dependent on the temperature of the ocean tide flowing towards it.
The mountain ranges and rivers in Southeast Asia have made a stripe like relief in the mainland of this region. The mountain ranges are in a north-south direction and separate the region into few big elongated valleys, and the 5 big rivers also are moving from the north towards the south (southeast, southwest as well), and are running in between the mountain ranges and cut through the valleys.