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
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9%
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4%
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flagGermany
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9%
68%
8%
151
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67%
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478
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11%
127
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123
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101
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63%
0%
49
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34%
0%
61%
2%
49
flagPoland
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10%
60%
6%
24223
flagthe United States
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6%
58%
5%
1158
flagthe Philippines
23%
4%
57%
10%
113
flagNigeria
30%
2%
56%
6%
143
flagBelarus
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12%
54%
12%
104
flagRussia
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16%
52%
13%
512
flagCanada
27%
7%
52%
9%
102
flagthe United Arab Emirates
25%
13%
52%
5%
36
flagFrance
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14%
51%
0%
35
flagUkraine
22%
16%
45%
12%
590
flagRepublic of Ireland
37%
13%
37%
8%
45