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 United States
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flagthe Philippines
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flagRepublic of Ireland
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