Question

What was Mohorovičić's observation?

Seismic waves penetrated all Earth's layers.

Seismic waves travelled at constant speeds.

Seismic waves could not go through the brittle crust.

Seismic waves travelled at varying speeds.

Answer 1

Seismic waves traveled at varying speed

Step-by-step explanation:

Answer 2

Seismic waves traveled at varying speeds.

Step-by-step explanation:

The Moho Discontinuity was discovered by one Croatian seismologist, Andrija Mohorovicic. He realized that the speed of a seismic wave depends on the density of the material the wave is moving through. Mohorovicic interpreted the acceleration of seismic waves observed within the Earth's crust as a change in composition of matter within the Earth.