A Sculpture is the branch of the visual arts that operates in three dimensions
Interesting, I am an artist and do admire sculptures. 
Durable sculptural processes originally used carving which is really hard to  do.
I bet they were difficult considering they didnt have much tools back then like we do today
Sculpture in stone survives far better than works of art in perishable materials and they are the ones that look the best in my opinion
Yes I agree stone lasts thousands of years of kept out of the rain. 
 Sculptures have been central in religious devotion in many cultures and many other things l
Yes some have even been used as idols in many cultures. 
though conversely traditions of sculpture in wood may have vanished almost entirely that is why i chose stones when it comes to buying one
Indeed, Its because wood rots over time and almost all wooden artifacts are gone from long ago.