As per National Aeronautics and Space Administration (NASA) research scientists found that concentrations of mercury near the ground level had increased in the Arctic Sea by mercurypumping reaction which takes place because -
1. of open water in a lead is much warmer than the air above it.
2. of the temperature difference, the air above the lead churns like the air above a boiling pot.
3. the mixing is so strong that it actually pulls down mercury from a higher layer of the atmosphere to near the surface.
Select the answer from the codes given below-
(a) 1 only
(b) 1 and 2 only
(c) 2 and 3 only
(d) All of the above