Which of these is not a process of chemical weathering?

dissolving of limestone which makes caves
cracked sidewalk
rusting nail
wearing away of the inscriptions on a new york city monument

I say cracked sidewalk because limestone dissloves, rusting nail is a nail getting to many chemicals surrounding it, and the last one is the statue of liberty is surrounded by about of h20 in the air.  why the sidewalk isn't the answer that is because of earthquakes or air bubbles in the cement

for e2020. the answer would be some directions from the mountain range so we can find mt. whitney. to locate which direction is north, you should use a   compass. this would not only find mt. whitney, but also becuase of this long paragraph you would get points because it's not like anyone actually reads your work becuase once they read the first sentence it sounds dumb enough to not read becuase i'm not good at answering this but the answer is compass for your benefit.

for e2020 ; -;