Okay as we all know, Covenant Ships are only building level going by this scene Since Halo sucks, I will assume it is only the minimum of building level, or .25 tons of TNT Also, since cinematic timing is BS, I will assume it took the length of the whole mission to destroy it. Or 5 minutes (That is how long I could stand the game) So it has a power output of 3,486,666.67 watts. I get 9.90256338e18 joules to do that. Now melting it would be wanking, I will assume they only pulverized it. Thus I only get 4.59835773e13 liters. The crust is 1% of the Earth. So the entire Earth is 4.59835773e15 liters.