The boundary between Earth's crust and mantle is _____.
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The outermost layer of sun is called
In terms of size, Earth ranks no. ___ in our Solar System.
Heavy water is mostly used in which of the following?
The absolute refractive index of air is
Who discovered television?
Which Player has been awarded Padma Bhushan in the year 2018 for his contribution to Cricket?
What will be the value of xy, if x2+y2 = 45 and x-y=5 ?