The precise radius of the inner core was not measured until relatively recently. How was this accomplished?
A) by Neil Armstrong conducting hammer seismic experiments during a 1960's Apollo Mission
B) by finding the S- wave shadow zone beyond 105°
C) by measuring the edge of the P- wave shadow zone from the great Chilean earthquake of 1960
D) by using a precisely known, underground nuclear weapons test in the Nevada desert in the early 1960s

Question

Quizplus · Accepted Answer

The precise radius of the inner core was measured using seismic data from underground nuclear tests, which provided clear signals for analysis.

The Precise Radius of the Inner Core Was Not Measured