Earths curved surface results in uneven heating of the surface. this uneven heating results in in the formation

This uneven heating lead to the water & air temperature difference between these places. This temperature difference create pressure difference. This pressure difference leads to creation of winds & ocean currents. It also create various climatic regions in world.

0.65volts

Explanation:

V = iR

V = 0.050 × 13

V = 0.65v