>>But that million kg of ice would not = 1 million litres.
>
>No, of course not. Let's make the calculations, irrelevant though they are. According to my physics book, ice has a density (typical value, I assume) of 917 kg./cu.m., that would be 0.917 kg. per liter. Dividing, the ice block of 1 million kg. wouldhave a density of about 1,090,000 liters.
>
>SNIP

>> So 1m Kg of ice DISPLACES more than 1 m litres of seawater.
>
>I don't agree with this part. If it were pushed forcefully under water, it would displace water according to its volume. But if it is left to float freely, the ice block would displace exactly the amount of water it weighs.

But if 1 M Kg of (a bigger) block of ice are underwater, those 1 M Kg displace 1.09 M litres.
So, if only that portion of the block below the surface were to melt (humour me - say it's held by pincers in water warmer than the atmosphere - like holding a sugar code at the top of your coffee) then the surrounding water should lose 0.09 m Litres in volumne.
I'm aware that a portion of the block is above the water (how much i don't know) - that is why I said the melting of this portion has to be taken into consideration.

>
>IOW, the ice block indeed has a volume of 90,000 liters (or litres) more than when it is in the liquid form. But those 90,000 liters are above the surface.