The Plot Shows Weathering Rate Measured As Surface Reduction Base Thickness Minus Top Thickness Vs Age For Marble Tom 1 (91.55 KiB) Viewed 47 times
The plot shows weathering rate measured as surface reduction (base thickness minus top thickness) vs. age for marble tombstones from one Australian cemetery. Marble is a metamorphic rock that is made of calcite crystals. The plot is for Sydney. Surface Reduction (mm) 0.35 0.30- 0.25 0.20 0.15 0.10 0.05 0.00 1870 FAR WESTERN Wilcannia Broken Hill 1880 Deniquin 1890 Bourke Cobar RIVERINA Hay MURRAY Wagga Wagga Albury ORANA 1900 CENTRAL WESTERN Dubbo 1910 Moree NEW ENGLAND ◆ Young Bathurst/ Armidale SOUTH EASTERN HUNTER Sydney Wollongong Batemans Bay Weathering Rates of Marble Tombstones in Sydney, Australia Taree 1920 1930 Inscription Date (Years AD) Lismore Coffs Harbour Newcastle ILLAWARRA NORTH COAST GREATER SYDNEY Data taken from Dragovich, D., 1986, Weathering Rates of marble in urban environments, eastern Australia, Zeitschrift für Geomorphologie, v. 30, p 203-214. 1940 1960 1960 1970
Answer the following questions: Sydney Tombstone: 1. What is the relationship between surface reduction and age? 2. What is your estimate for the mean weathering rate (in mm/century)? Draw a best-fit line 3. Assuming a tombstone is 20 cm thick, how many years will it last at this weathering rate? Show your work please. 1 cm=10 mm 4. How do you think the weathering rate for this marble tombstone would compare with a hypothetical nearby granite one? Explain why.
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