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Exploring the Number of Volcanoes in the World

Understanding the Definition and Types of Volcanoes Volcanoes are openings in the Earth’s surface through which molten rock, ash, and gas can escape. They are formed when magma from deep within the Earth rises to the surface and erupts, releasing the pent-up pressure. There are three main types of volcanoes: shield, cinder cone, and composite. Shield volcanoes are broad, gently…