Correction for the weight of a Hippopotamus
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How heavy is 0.000000420 megatonnes?
It's about one-tenth as heavy as a Hippopotamus
The weight of a Hippopotamus is about 0.00000380 megatonnes.
(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 0.00000380 megatonnes. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).