The average rate of seafloor spreading in the South Atlantic can be calculated from the data provided in table 5 and in the graph, you made. In preparation for this calculation, prepare a sketch as follows: (10 points) < In a space below, sketch a schematic profile across the Mid-Atlantic ridge in the South Atlantic showing the relationships of distance and age that you plotted. < Label the spreading axis with its age and add units to your profile (distance in km, age in million years) < Based on this sketch, write a simple formula to calculate the average spreading rate. Magnetic Anomaly Site No. No. 16 5 15 6 T 18 17 === 14 13-14 19 21 20 30 21 TABLE 5 Magnetic Anomaly Numbers and Ages, Paleontological Ages, and Distances of Mid-Atlantic Ridge Sites from the Axis T Magnetic Age of Basement (m.y.) 9 21 34-38" 38-39 53 70-72 Paleontological Age Sediment Above Basement (m.y.) 11 + 1 24 +1 26 +1 33 +2 40+ 1.5 49 +1 67 +1 >76 Distance from ridge axis (km) Linear 191 +5 380 + 10 506 +20 643 20 727 + 10 990 10 1270+ 20 1617 + 20 Rotation at 62N, 36W 221 +20 422 + 20 506 20 718 20 745 + 10 1010 + 10 1303 + 10 1686 + 10