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Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt. Extremely high temperature and pressure cause the rock to melt and become liquid rock or magma.
1 Pressure builds and magma explodes to the surface causing a volcanic eruption. 2  The lava from the eruption cools to form new crust. 3  After several eruptions, the rock builds up to form a volcano.4  The magma chamber is a collection of magma below the volcano.ey points. 1  Volcanic eruptions can happen at destructive and c onstructive boundaries. 2  Volcanoes form when magma rises through cracks or weaknesses in the Earth's crust. 3  Pressure builds and magma explodes to the surface causing a volcanic eruption. 4  The lava from the eruption cools to form new crust.