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1 gigatonne (Gt) = 1,000,000,000,000 or 1012 kg
Megaton and ton are different things: megaton is a unit of enery; ton a unit of weight. A megaton is the energy released from detonation of TNT. A ton is 2,000 pounds.
In the metric system, the prefix "mega-" denotes a factor of 1,000,000. Therefore, a megaton is equivalent to one million tons. Since a ton is equal to 2,000 pounds, a megaton is equal to 2 billion pounds. The number of zeros in a megaton is determined by the number of zeros in the numerical value of 2 billion, which is nine zeros.
"giga" is a prefix used to indicate "billion" or 109. 1 gigatonne = 109 tonnes, or 1,000,000,000 tonnes
One million of them.