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What is the difference between shield and composite volcanoes?
What causes the differences in their shape and eruptions?
The differences are mainly due to the types of lava and magma involved. Shield volcanoes are formed by low-viscosity basaltic magma, which allows lava to flow more easily and create the broad, sloping shape. Composite volcanoes, on the other hand, are formed by more viscous andesitic or dacitic magma, which traps gas and builds up pressure, leading to more explosive eruptions.