Question

what is variation in value of g​

Answer 1

Its value is 9.8 m/s2 on Earth. That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2. ... There are slight variations in the value of g about earth's surface. These variations result from the varying density of the geologic structures below each specific surface location.

Answer 2

$\large\sf{\underline{\underline{Variation \ in \ g}}}$

1] With increase in height from the earth's surface, the value of g "decreases".

2] With increase in depth from the earth's surface ( towards the center of earth ), the value of g "decreases".

$\star$ On the earth's surface, the value of g is 9.8 m/s.