Chapter 26, Problem 5RQ

What was Andrija Mohorovičićs major contribution to Earth science?

To determine

The contribution of Andrija Mohorovičićs in Earth science.

Answer to Problem 5RQ

Andrija Mohorovičić concluded that there are different layers of Earth on the basis of the density of the rocks. He discovered the boundary of the Earth’s mantle where it is separated from the crust.

Explanation of Solution

Andrija Mohorovičićs was a meteorologist and geophysicist. He studied seismographs from a local earthquake. While studying, he realized that the seismic waves are faster as it goes deeper from the Earth's surface. The waves took speed only if there is a change in density. Therefore, he concluded that at a certain depth, Earth has a different density of rocks due to which the seismic waves become faster.

The seismograph was observed by Andrija Mohorovičić, which showed the upper boundary of Earth's mantle where there were denser rocks underlying the less dense crust. This boundary, which differentiates the mantle and the crust, is known as Mohorovičić discontinuity or "Moho." Therefore, Andrija Mohorovičić was able to discover the layers of Earth's surface.

Conclusion:

Therefore, Andrija Mohorovičić concluded that there are different layers of Earth on the basis of the density of the rocks. He discovered the boundary of the Earth’s mantle where it is separated from the crust.