SOLAR SYSTEM

Detailed explanation-1: -Seismic waves travel more quickly through denser materials and therefore generally travel more quickly with depth. Anomalously hot areas slow down seismic waves. Seismic waves move more slowly through a liquid than a solid.

Detailed explanation-2: -Since density * increases with depth, waves speed up as they move deeper into the Earth. The change in density also causes the waves to follow curved paths as they move through the Earth. As waves travel into more dense material, they speed up and curve.

Detailed explanation-3: -Seismic waves move outward in all directions away from their source. Each type of seismic wave travels at different speeds in different materials. All seismic waves travel through rock, but not all travel through liquid or gas. Geologists study seismic waves to learn about earthquakes and the Earth’s interior.

Detailed explanation-4: -The types of waves that are useful for understanding Earth’s interior are called body waves, meaning that, unlike the surface waves on the ocean, they are transmitted through Earth materials. Imagine hitting a large block of strong rock (e.g., granite) with a heavy sledgehammer (Figure 9.3).