The volcano illustrated in diagram A is cinder cones, in diagram B is Composite volcano and in the diagram, C is Shield volcano. Composite volcano made when hot molten rock ash and gases escape from an ongoing in Earth's surface.
What is a natural disaster?
A natural disaster is categorized as a catastrophic event with atmospheric geological and hydrological origins such as drought, hurricanes, floods, volcanoes, earthquakes, landslides, etc.
Natural disaster causes major destruction of property, houses, social and environmental damage. People have to migrate and live in shelter homes.
Therefore Volcano occurred it bring magma and lava.
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