Final answer:
A volcano is a conical hill built around a vent and is composed of different layers. Volcanic eruptions are caused by the movement of magma from the Earth's mantle, resulting in the release of lava, ash, and gases.
Step-by-step explanation:
Structure of a Volcano
A volcano is a conical hill or mountain built around a vent that connects to reservoirs of molten rock beneath the Earth's surface. The structure of a volcano is composed of different layers. The main parts include the magma chamber, conduit, crater, and vent.
Causes of Volcanic Eruptions
Volcanic eruptions are caused by the movement of magma from the Earth's mantle to the surface. The main factors that cause a volcano to erupt are the build-up of pressure, the presence of volatile components like water vapor and gases dissolved in the magma, and the strength of the volcanic rock.
When the pressure becomes too high, the magma forces its way to the surface through the conduit and vent, erupting as lava, ash, and gases. The type of eruption and the volcanic hazards associated with it depend on the composition and viscosity of the magma.
Learn more about Volcanoes