What causes a volcano to erupt, how they formed and different types of volcano revealed squib

THERE are around 1,500 volcanoes on land which have been active in the last 10,000 years spewing ash into the atmosphere periodically. As about 50 to 60 volcanic eruptions happen each month we’ve brought together all the facts that you should know about the spectacular and potentially devastating natural events. What makes a volcano erupt? […]
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