Measure the amount of offset of the 50-Ma granite body. Approximately how many kilometers has the granite body been offset?
Ans:
1,100 km
The granite body has been offset by about 1,100 km. Be sure that you're measuring the distance between the same edges of the offset bodies (e.g., from one western edge to the other western edge) and to convert the measured distance to kilometers using the scale provided. For example, I measured the distance between the offset granite bodies as 77 mm. I measured 100 km on the scale as 7 mm. Set up a ratio to find the distance between the granite bodies: (77 mm / 7 mm) = (d / 100 km).
Cross-multiply to solve for d: (77 mm)(100 km) = (7 mm)d
d = 7,700 km / 7 = 1,100 km
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