A lot.
There is 1000 in the difference between a metre and a kilometre. Then this figure is cubed, it becomes 1 billion (1,000,000,000 metres cubed).
A metre cubed is 1000 litres.
So there are 1,000,000,000,000 litres in a cubic kilometer.
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There are zero cubic metres in any number of square kilometres; any two-dimensional area has zero volume.
There are 1 million square meters in 1 square kilometre.
There are 1 billion cubic meters in 1 cubic kilometre.
Well approaching the problem from the other end, there are 1000 x 1000 x 1000 cubic metres in 1 cubic kilometre. i.e 109.
So a cubic kilometre will be 10-9 of a cubic metre. i.e. 0.000 000 0001.
one billion because 1000 m = 1 km so there are 10003 = 1 billion meters cubed in a kilometer cubed.