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Physical Science

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Please help me with this. I just don't get it.

The average rate of chemical weathering of carbonate rock in an urban area is 2.1 x 10^-3 mm/yr. The depth of lettering of the tombstones shown in the table below was measured in 2010:

Date on Tombstone Age (yr)
1910 100
1921 89
1948 62
1958 52
1975 35

How much has the depth of the lettering been reduced on each tombstone?

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