Question: how do volcanos erupt

Hussain Jaffery answered on 10 Nov 2015:

There’s a lot of activity going on under the surface of the Earth. Beneath the layer we live on, called the crust, there are many other layers of molten rock and lava. And if you go all the way to the centre of the Earth, you will find a really hot core burning at thousands of degrees. This is because the gravity in centre of the earth is so strong that everything keeps pushing into the centre and rubs and becomes very, very hot. The earth’s core has been hot from the time the planet formed.

This heat causes magma layers to keep warm and overtime they get a little too hot and pressure builds up. A lot of pressure and a weak and shallow point in the earth’s crust causes bursts of molten magma and lava to burst out. Often this can be violent in an volcano, or very calm, such as constant lava flows. Volcanoes can even erupt underwater and are responsible for making some islands, including Hawaii, in the Pacific Ocean.