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Many volcanoes are on land, but most of them are on the ocean floor. Volcanoes erupt and lava spews over the land or underwater. After the lava cools, it hardens. After this happens over and over again for thousands or millions of years, new land is formed.
Volcanoes Form New Lands
This photo shows an island in Hawaii. They were formed by underwater volcanoes over a million years.
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