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Volcanoes • A volcano is a special type of mountain with an opening at its top. How is a volcano formed? • The inside of the Earth is very hot. • Magma are rocks that melted. • Magma is in “magma chambers” far underground. • But eventually, the magma pushes upward and erupts from cracks in the Earth’s surface. What does “erupt” mean? • Erupt means to burst out. • An eruption can be very strong or rather gentle. • Magma that erupts out the Earth’s surface is called Lava. How do volcanoes change the Earth’s surface? • Eventually, the hot lava cools into solid rock. • More lava on the Earth’s surface forms a mountain or another volcano. • Each time a volcano erupts, more lava spreads over the volcano and it gets taller and taller. • Volcanoes change the Earth’s surface quickly. • Some volcanoes are formed under the ocean. • Hawaii and Japan are groups of islands that formed from volcanoes.