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%
9%
72%
4%
43
flagGermany
13%
9%
68%
8%
153
flagthe United Kingdom
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5%
67%
5%
479
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3%
67%
11%
127
flagPakistan
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123
flagIndia
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5%
66%
6%
1080
flagKazakhstan
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15%
66%
5%
102
flagUnknown
22%
14%
63%
0%
49
flagMalaysia
34%
0%
61%
2%
49
flagPoland
21%
10%
60%
6%
24252
flagthe United States
26%
6%
58%
5%
1158
flagthe Philippines
23%
4%
57%
10%
113
flagNigeria
30%
2%
56%
6%
143
flagBelarus
18%
13%
53%
13%
106
flagCanada
27%
7%
52%
9%
102
flagthe United Arab Emirates
25%
13%
52%
5%
36
flagRussia
15%
16%
51%
13%
514
flagFrance
28%
14%
51%
0%
35
flagUkraine
22%
16%
45%
12%
591
flagRepublic of Ireland
37%
13%
37%
8%
45