Final answer:
A volcano is a rupture in the Earth's crust that allows magma and gas to escape through an eruption. Volcanoes can have different types of eruptions, and are formed when tectonic plates separate or when pressure builds up in the Earth's mantle.
Step-by-step explanation:
A volcano is a rupture of the Earth's crust that allows magma and gas to escape. It is formed when tectonic plates move apart or when pressure builds up in the Earth's mantle, forcing magma to rise and eventually erupt. Volcanoes can have different types of eruptions, ranging from gentle lava flows to explosive eruptions with ash clouds and pyroclastic flows.
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