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Considering Earth's potential as 0 is nothing but an assumption.We assume that Earth  is a collection of infinte negative charge and it can even supply more charges to it.As earth has such a huge amount of negative charge with capacity to be supplied with even more any other body will  be positive w.r.t Earth.Hence we assume its potential to be zero.

Aliter

As Earth can store unlimited charge its capacitance is infinity

Q=CV

=>C=Q/V

As C is infinity V has to be 0.

Hope this solved your query

Regards

 

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Hello

Any even number has a general form of 2x(where x is any positive integer)

Take cube of  the number  that is cube of 2x

(2x)^{3}

=8(x)^{3}

So 8 multiplied with any number is even

Hence cube of any number is even

So the given statement is true

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