Discussion
The value of 'g' (acceleration due to gravity) at a place varies with time due to which of the following :
Answer: A
The value of g at a place varies with time because of isostatic rebound.
Where an ice sheet has melted, as in Scandinavia and Canada, the crust is still rising slowly to regain isostatic equilibrium, and mantle material flows in beneath it. The station moves away from the Earth's centre and the mass distribution beneath it changes, so the measured gravity there changes measurably over years and decades.
The topography of the continents and lateral differences in rock composition make g vary from place to place, not with time at one place. The Earth's rotation lowers g by a fixed amount that depends on latitude, so it too gives no change over time at a given station.
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