The variation of atmospheric potential is caused due to:
(A) Difference in temperature over the surface of the earth
(B) Change in the density of air
(C) Both (a) and (b)
(D) Neither (a) nor (b)
(A) Difference in temperature over the surface of the earth
(B) Change in the density of air
(C) Both (a) and (b)
(D) Neither (a) nor (b)