Variation in the value of g.

Explanation

The value of g varies based on the following
a. Along the surface of the earth.
* The earth is not perfectly sphereical.
* It is bulged at the equator and flattened at the pole, due to its rotation.
* The radius is highest at the equator and least and the poles.
* Value of g is highest at poles `(9.832m//s^(2))`
* Value of g is least at equato `(9.78m//s^(2))`
b. Change with height.
* As height increases, value of g decreases.
* The change is negligibkle for height smaller than the radius of the earth.
c. Change with depth
* As depth increases, value of g decreases.
* This is because, as we go inside the earth, the mass under consideration decreases.
* Hence value of g decreases.