Since 1998, Harvard University wraps marble statues on its campus with waterproof covers every winter. Why?
to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
The eastern third of the United States is significantly impacted by acid rain. Acids in the rain react with the calcium compounds in the stones like limestone or marble to create gypsum, which then flakes off.
reach: rather globalartchemistryecologymonumentsnatureuniversities
Answers by country
to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
answers
the Netherlands44
Germany160
the United Kingdom484
Australia129
Pakistan124
India1081
Kazakhstan105
Unknown49
Malaysia50
Poland24318
the United States1170
the Philippines113
Nigeria143
Belarus108
Canada102
the United Arab Emirates36
Russia525
France35
Ukraine596
Republic of Ireland45