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Geography, 04.11.2020 19:20 jobmoon

During a field trip, Liu notices that an old marble statue looks different from a new marble statue. The surface of the old statue is rough while the new statue is smooth and shiny. There is a high level of pollution in the area the statues are located. What is most likely the cause of the difference in the way the statues appear?

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During a field trip, Liu notices that an old marble statue looks different from a new marble statue....
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