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.
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Answers by country

to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
answers
flagthe Netherlands
10%
10%
75%
5%
20
flagIndia
17%
4%
70%
4%
569
flagthe United Kingdom
17%
4%
70%
4%
275
flagKazakhstan
3%
18%
70%
7%
27
flagNew Zealand
15%
15%
70%
0%
20
flagPakistan
16%
7%
67%
5%
71
flagAustralia
15%
5%
66%
9%
51
flagMalaysia
30%
0%
66%
0%
33
flagBelarus
14%
11%
65%
8%
35
flagUnknown
22%
14%
63%
0%
49
flagNigeria
21%
3%
63%
9%
33
flagCanada
22%
8%
60%
10%
50
flagGermany
18%
12%
60%
8%
48
flagSingapore
25%
5%
60%
10%
20
flagPoland
22%
10%
59%
6%
20524
flagthe United States
26%
5%
59%
5%
830
flagthe Philippines
28%
2%
57%
11%
70
flagRussia
15%
15%
49%
17%
106
flagUkraine
27%
16%
45%
8%
186
flagRepublic of Ireland
40%
15%
25%
15%
20