What is the significance of the meltdown at chernobyl ?

Chernobyl Accident 1986. The Chernobyl accident in 1986 was the result of a flawed reactor design that was operated with inadequately trained personnel. The resulting steam explosion and fires released at least 5% of the radioactive reactor core into the atmosphere and downwind – some 5200 PBq (I-131 eq).

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c- cold periods in earth's history during which glaciers covered much of the surface.

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