Question

What was Mohorovičić’s observation?

A. Seismic waves could not go through the brittle crust
B. Seismic waves travelled at constant speeds
C. Seismic waves travelled at varying speeds
D. Seismic waves penetrated all Earth’s layers

Answer 1

Mohorovičić's observation, known as the "Moho," indicated that seismic waves travel at varying speeds through different layers of the Earth. Specifically, he observed that there was a distinct boundary between the Earth's crust and the underlying mantle where seismic waves change speed. Therefore, the correct answer is:

**C. Seismic waves travelled at varying speeds**.