Uring a field trip, Liu notices that an old marble statue looks different from a new marble statue. The surface of the old statue is rough while the new statue is smooth and shiny. There is a high level of pollution in the area the statues are located. What is most likely the cause of the difference in the way the statues appear?

Liu notice that the old marble statue looks different from the new one also the old marble statue is rough while the new marble statue is smooth and shiny. Chemically marble is mixture of majorly  Calcium oxide, Silica ,Alumina and other salts.

Since the environment is highly polluted so it enables chemical reactions on the surface of the statues and that is what causing the degradation of the statues to loose their shine and smoothness

Hence,  the new statues looked smooth and shiny while the old statues looked rough and dull.  

check out this website

you will enjoy it as it give interesting things to look up or do!