The correct answer is True
Step-by-step explanation:
The Mohorovicic discontinuity refers to a limit or boundary found between the oceanic and continental crust, but also between the crust and the mantle. This was first discovered by Andrija Mohorovicic at the beginning of the 20th century as while monitoring the speed of waves through Earth he noticed certain particularities in the waves as the speed of two types of waves increased in this zones which suggested there was another layer or a boundary between thicker layers. Additionally, by doing this it was possible to know the Mohorovicic discontinuity can be found from 10 to 70 km deep. Therefore, the Mohorovicic discontinuity was indeed discovered by monitoring the speed of seismic waves through Earth.