How do seismic waves help scientists understand Earth's layers? Select the two correct answers.(1 point) Responses Scientists can observe which seismic waves change the composition of the layers they pass through. Scientists can observe which seismic waves change the composition of the layers they pass through. Scientists can observe which seismic waves cannot pass through certain layers. Scientists can observe which seismic waves cannot pass through certain layers. Scientists can observe how seismic waves change speeds when passing through different layers. Scientists can observe how seismic waves change speeds when passing through different layers. Scientists can generate seismic waves in order to observe their paths through Earth. Scientists can generate seismic waves in order to observe their paths through Earth. Scientists can observe how seismic waves multiply when passing through different layers.

Answer 1

The two correct answers are:

1. Scientists can observe which seismic waves cannot pass through certain layers.
2. Scientists can observe how seismic waves change speeds when passing through different layers.

These observations help scientists understand the different properties and compositions of Earth's layers, such as the rigid mantle, the soft outer core, and the solid inner core.