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Volcanoes occur when magma makes it way to the surface. The volcano begins as a lava flow but as it continues to erupt the volcano gets bigger. The volcano eruptions are determined by the pressure and density of the magma chamber.

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9y ago
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8y ago

Volcanoes occur as a rupture on a planet's crust.

Earth's volcanoes are generally found where tectonic plates are converging or diverging.

For example, the Earth's Mid-Atlantic Ridge has volcanoes that are caused by divergent tectonic plates that are pulling apart; whereas the Pacific Ring of Fire has volcanoes that are caused by convergent tectonic plates that are coming together.

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Q: Where and why do volcanoes occur?
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