How are island's made

As volcanoes erupt, they build up layers of lava that may eventually break the water's surface. When the tops of the volcanoes appear above the water, an island is formed. While the volcano is still beneath the ocean surface, it is called a seamount. Oceanic islands can form from different types of volcanoes.

Explanation:

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heat from the core of the earth causes convection currents to occur in the mantle. these currents slowly move the crust around.