At a small height h above Earth’s surface the decrease in acceleration due to gravity is Δg1. At the same depth h below the surface the decrease is Δg2. Which relation between Δg1 and Δg2 is correct?
a) Δg1=Δg2
b) Δg1=21Δg2
c) Δg1=2Δg2
d) Δg1=4Δg2