The Earth's crust is made up of tectonic plates. Volcanoes are formed when magma from the Earth's mantle pours out through the cracks in the crust. Once magma reaches the Earth's surface, it is called lava. Once the lava from the eruption cools, it forms a new crust, just like at the bottom of the ocean where seafloor spreading occurs. Over time, after a number of eruptions, the rock builds up, and a volcano forms. Volcanoes can still get bigger and bigger as they continue to erupt and new crust is added each time. Volcanoes can vary in size, appearance and composition. Find out the name of a mountain that is not an example of a volcano.
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