What impact can a very large volcanic eruption have on earth's climate?

When volcanoes erupt,   the let mixture of gases and particles into the air.  some gasses are  as ash and sulphur dioxide, have a cooling effect, because they reflect sunlight away from the earth. Others, such as CO2, cause warming by adding to the the greenhouse effect   

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i didn’t understand your question but archipelagos are groups of island hope this

It is useful for historians to write narratives so that history can be passed on from their point of view.  think about a story being told in third person, then think about it again being told in first person, by someone who actually experienced the event.