by 
Chris
ANSWERS: 1
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I can only look at what is on the net and I found from Wikipedia that the "It has an outer layer of water thought to be around 100 km (62 mi) thick; some as frozen-ice upper crust, some as liquid ocean underneath the ice." Since, it is 3000 km in diameter, you would have to do the maths to work out how much is there.
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