volcanoes are made by magma under the earths surface the upper mantle to be precise (as shown in image above) boils up to the top it erupts to the surface to form magma and ash, between eruptions the magma stays in its chambers sometimes even for hundreds of years until the next eruption.
The image above shows different points of a volcanoe from inside and outside of the vent itself.
The image above shows different points of a volcanoe from inside and outside of the vent itself.
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