Volcanoes form where magma reaches the surface. Some form along plate boundaries, others are hotspot volcanoes found in the middle of plates. Common volcanic gases include water vapour (H2O) and carbon dioxide (CO2). Larger eruptions are sometimes described as VEI 5+.
Mount St. Helens erupted in 1980 (United States Geological Survey).
Krakatoa’s 1883 eruption was heard thousands of kilometres away.
Eyjafjallajökull (Iceland, 2010) disrupted European air travel.
Learn more from the United States Geological Survey website.
The term VEI helps compare eruption sizes. Some events reach VEI 5+.
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Lava temperatures can exceed 1100°C and ash plumes can rise 10 km or more. Sulphur dioxide is often written as SO2 (look up how to write that!). Water is H2O and carbon dioxide is CO2.
Some historic records use ordinal dates like 24th August — try adding a <sup> tag where appropriate.