How does a volcano erupt?
A volcano is known as a ‘vent’ or a chimney. A volcano connects Magma within the earth’s crust to the Earth’s surface. The liquid rock is called Magma when it is underneath the Earth’s Surface, but when it rises onto the Earth’s surface, it is then Hot Lava.
The molten rock which is stored in the Magma chamber rises through the crater pipe pockets. As it continues up the main vent, the gasses start to expand and the water becomes steam which then creates pressure. When the pressure in the volcano can no longer be enclosed, the volcano erupts through the crater and smaller secondary side vents.
Most volcanic gases include Water vapour, carbon dioxide, sulfur dioxide, hydrogen fluoride, hydrogen chloride, hydrogen sulfide. Most people believe that volcanoes are a cone shaped mountains, but that isn’t true. There are many different sized and forms of volcanoes. Some are even underwater or even under ice caps.
This is how a volcano erupts, when the lava has cooled down and become rock, the process of a volcanic explosion starts again.