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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.
Earthquakes and Volcanoes Key Concept What causes volcanoes to form? Directions: Use the diagram to answer each question on the lines provided. 1. Why does magma move upward? 2. What happens when magma erupts on the surface? 3. What is a volcano? 4. Where do volcanoes form? 5. How is the mid-ocean ridge shown in the diagram formed? 6. How does low pressure cause volcanoes to form? 7.