Question: why do volcanos errupt? amd why and how is lava made?

Caroline Roche answered on 22 Oct 2024:

Volcanoes erupt when magma from inside the earth pushes its way to the surface and finds a gap or crack it can go through. Gases inside the magma decide how that magma is going to come out of the volcano, if the gases can escape easily then the magma will just flow out. If the gases can’t escape easily, the pressure inside will increase until it can and then you get your big eruption.
Like having two bottles, one filled with water and one with a fizzy drink. If you shake both and then go to pour them out, the water will just flow out of its bottle but the fizzy drink will erupt out of its bottle.

Lava is what magma is called once it has erupted from the volcano. It is made up of molten rock (half melted rocks from inside the earth) and gases from the earths mantel. The intense heat and pressure within the earth is what creates the molten rock.