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islands
Islands are bodies of land completely surrounded by water. They are smaller than continents. They are located in oceans, lakes, and rivers across the world. Some islands are countries, some are uninhabited, some are wildlife refugees. Islands vary greatly in size and use. A small island is called an islet. The largest island in the world is called Greenland. There are five main types of islands: continental islands (areas of land which were once connected to a continent), tectonically formed islands (created by the movement of the plates that make up the earth's crust), volcanic islands (consisting of lava and ash built up by eruptions of oceanic volcanoes), coral islands (flat islands consisting of mainly coral reef material), and barrier islands (consisting of sediment built up along a shoreline).
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