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Volcanoes occur where they do because of the position of the crust over a plate boundary or a 'hot spot' in the Earth's mantle.

Continental volcanoes form when subducted crust melts to magma against the mantle, then is forced upward under pressure through cracks in the rocks above.

Sea volcanoes occur where the oceanic crust is heated from below as it moves over a "hot spot" in the mantle. The liquefied rock is pushed up into the ocean, where it solidifies, notably into a volcanic atoll or island. The islands of Hawaii have all formed from the same hot spot as the crust moved generally NW over millions of years.

Volcanism is also present at divergent plate boundaries, which may be located at mid-ocean ridges, or rifts on continents. The pulling apart of two plates at these locations causes rift volcanism and the upwelling of melting decompressed asthenospheric mantle material, creating new crust.

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12y ago
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13y ago

Earthquakes and volcanoes occur because of the plates. If land is sitting on a subduction zone or a fault line it is most likely that earthquakes will occur. Volcanoes usually occur where plates push up against one another and pushes through the crust creating a mountain like feature, then it is easy for the magma below the mantle to push up and create an active volcano.

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11y ago

because if there were no volcanoes in the world every thing would be water and we would not have any land.

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13y ago

Because that is where they plate tectonics collide and there is a hot spot underground.

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13y ago

When the big bang happened thousands and thousands of years old, the meteors that had crashed down made holes in the earth that we call today volcanoes.

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11y ago

Because they are closer to the earths crust.

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12y ago

Volcanoes appear on crevasses that let up magma that makes mountains with the lava, I think.

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Q: Why do volcanoes occur where they do?
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