Charlotte it might be worth reminding ourselves of what is a volcano, and why do they occur. I’ll let my friends start the discussion.
Some interesting thoughts team but we have to look at Charlotte’s question.’How many volcanoes can go of at once?’ Firstly there are recorded to be 1500 volcanoes in the world as we know it. There are also lots of volcanoes under the sea but we don’t know how many. Of the 1500 about 500 have been active over the last 100 years. So Charlotte, it is quite difficult to give you a definitive answer. For a volcano to erupt there needs to be some activity in the magma (the molten core of our Earth) and maybe the tectonic plates (the mantel plates that make up the surface of our Earth). Where the plates meet there is lots of tension, this normally causes earthquakes (New Zealand) but could allow magma to escape via a volcano.