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
flagthe United Kingdom
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5%
67%
5%
478
flagGermany
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9%
67%
8%
146
flagAustralia
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3%
67%
11%
127
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123
flagIndia
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5%
66%
6%
1079
flagKazakhstan
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15%
66%
5%
101
flagUnknown
22%
14%
63%
0%
49
flagMalaysia
34%
0%
61%
2%
49
flagPoland
21%
10%
60%
6%
24188
flagthe United States
26%
6%
58%
5%
1153
flagthe Philippines
23%
4%
57%
10%
113
flagNigeria
30%
2%
56%
6%
143
flagBelarus
19%
12%
54%
11%
101
flagCanada
26%
7%
53%
9%
101
flagthe United Arab Emirates
25%
13%
52%
5%
36
flagRussia
16%
16%
51%
13%
506
flagFrance
28%
14%
51%
0%
35
flagUkraine
22%
16%
45%
12%
584
flagRepublic of Ireland
37%
13%
37%
8%
45