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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to protect from frost
to protect from birds
to protect from acid rains
to protect from graffiti makers
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flagthe Netherlands
11%
11%
72%
5%
18
flagthe United Kingdom
18%
4%
71%
4%
249
flagIndia
17%
4%
70%
4%
541
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15%
70%
0%
20
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7%
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5%
69
flagAustralia
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66%
9%
51
flagMalaysia
31%
0%
65%
0%
32
flagNigeria
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3%
64%
6%
31
flagUnknown
22%
14%
63%
0%
49
flagSingapore
26%
5%
63%
5%
19
flagCanada
21%
6%
61%
10%
47
flagthe United States
26%
5%
60%
5%
802
flagthe United Arab Emirates
33%
0%
60%
6%
15
flagPoland
22%
10%
59%
6%
19965
flagthe Philippines
28%
2%
58%
10%
67
flagBelarus
18%
14%
55%
11%
27
flagGermany
24%
16%
51%
8%
37
flagRussia
15%
16%
48%
17%
92
flagUkraine
26%
15%
47%
8%
156
flagRepublic of Ireland
47%
17%
11%
17%
17