Study Fig. 3, which shows surface weathering of marble tombstones, in an area of Sydney, Australia, where acid rain occurs.

1. (a)(i)Draw a best fit line on the scattergraph in Fig. 3.[1]
2. (a)(ii)Describe the relationship suggested by the graph.[1]
3. (b)The marble is weathered by carbonation. Describe this process.[2]
4. (c)(i)Use the data in Table 1 to plot, on Fig. 3, the four data points for tombstones at Wollongong, Australia. Date on tombstone | Surface reduction (mm) 1940 | 0.13 1930 | 0.20 1905 | 0.18 1893 | 0.21[2]
5. (c)(ii)Which location, Sydney or Wollongong, has more acidic rain?[1]
6. (c)(iii)Suggest why the rainfall might be more acidic.[1]

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