Scientists, including Andrija Mohorovićić, studied seismic waves to understand Earth's layers primarily by observing how seismic waves change speeds when passing through different layers and which seismic waves cannot pass through certain layers.
When seismic waves travel through the Earth, they encounter different materials, which can affect their speed and behavior. For example, seismic waves travel faster through solid materials than through liquids. Mohorovićić is particularly known for his discovery of the "Moho" (the Mohorovičić discontinuity), which marks the boundary between the Earth's crust and the underlying mantle, based on the changes in speed of seismic waves.
Thus, the most relevant options are:
- Scientists can observe how seismic waves change speeds when passing through different layers.
- Scientists can observe which seismic waves cannot pass through certain layers.
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