Q8.10 Judging from the longitudi-
nal gain of the projection of the solid
core's high-velocity seismic pathway
between 1990 and 1996 (Fig. 8.12),
what is the approximate annual
advance over Earth's surface in
degree(s) of longitude per year(s)?
Hint: Do the simple math involving
the difference in longitude markers
and the difference in year markers.