https://volcano.si.edu/faq/index.cfm?question=eruptionforecast

https://www.ready.gov/volcanoes

https://www.usgs.gov/faqs/how-do-volcanoes-erupt

https://www.bgs.ac.uk/discovering-geology/earth-hazards/volcanoes/how-volcanoes-form-2/

What is a volcano??

A volcano is an opening in the Earth’s crust that allows magma, gases and debris to escape to the surface.

What goes on when a volcano                           occurs?

Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers which is a large pool of magma. Eventually, some of the magma pushes through cracks to the Earth's surface. Magma that has erupted is called lava.