In 1936, Lehmann discovered a zone of reflection and refraction within the core (below about 5000 kilometres depth), giving the first evidence of an inner core.

Name: In 1936, Lehmann discovered a zone of reflection and refraction within the core (below about 5000 kilometres depth), giving the first evidence of an inner core.
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This statement is true. Lehmann's discovery of the reflection and refraction zone within the core provided evidence for the existence of an inner core.

In 1936, Lehmann Discovered a Zone of Reflection and Refraction