What causes volcano to erupt?

Answer 1

Usually the magma clogs causing major pressure causing the volcano to explode violently or some times movement in the earths crust

Answer 2

A volcano erupts when pressure from the vent forces magma up through a tube looking thing inside a volcano, like a thick toothpaste through a narrow tube. When the magma reaches the surface, the volcano erupts.

Answer 3

Rocks under a volcano become hot enough to melt (the source of this heat can be friction at a plate boundry or a mantle plume at a "hot spot") The molten rock (called magma) collects in an underground chamber. As more magma is produced, the pressure increases. If the pressure becomes too much the molten rock is forced out of the top of the volcano. The way in which this happens - exposively or gently - depends greatly on how much volatile content there is in the magma.

Answer 4

Volcanic eruptions are caused by the build-up of pressure in magma chambers beneath the Earth's surface. As magma rises and reaches the surface, it can erupt explosively or effusively, depending on its composition and gas content. External factors such as tectonic movements or the presence of water can also contribute to triggering volcanic eruptions.

Answer 5

magma and heat pressure