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If wave behavior changes at the Lehmann boundary it will be related to what?

Answer and explanation

Correct answer: Boundary of outer and inner core

The Lehmann boundary is a seismic boundary inside the Earth. It separates the liquid outer core from the solid inner core. When seismic waves reach this boundary, their speed and path can change because they are entering material with different physical properties. Scientists used such changes in wave behaviour to infer that the Earth’s core is divided into an outer and an inner part.

Option D is correct because it identifies the boundary between the outer core and the inner core. The other choices concern the atmosphere, crops, or rivers and cannot explain a deep seismic boundary. It is also useful to distinguish Lehmann discontinuity from the Moho discontinuity: Moho separates the crust and mantle, whereas Lehmann concerns the inner structure of the core. Thus the changed wave behaviour points to the outer-core–inner-core boundary.

Related tags

Lehmann-BoundaryInner-CoreCore-Boundary

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