Age of Rock Quiz

Question

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Question
What was Mohorovičić's observation?(1 point)
Responses

Seismic waves travelled at constant speeds.
Seismic waves travelled at constant speeds.

Seismic waves could not go through the brittle crust.
Seismic waves could not go through the brittle crust.

Seismic waves travelled at varying speeds.
Seismic waves travelled at varying speeds.

Seismic waves penetrated all Earth's layers.

Answer 1

The correct response to the question about Mohorovičić's observation is:

Seismic waves travelled at varying speeds.

This observation led to the identification of the Mohorovičić discontinuity, or "Moho," which marks the boundary between the Earth's crust and the underlying mantle. The varying speeds of seismic waves indicated a transition in material properties at this boundary.