Final answer:
Seismic waves are used to probe the density and elastic moduli of Earth's interior by interacting with different materials in the interior. The velocity of these waves changes based on the density of the materials, allowing scientists to distinguish the properties of Earth's internal layers.
Step-by-step explanation:
Seismic waves are used to probe the density and elastic moduli of Earth's interior. Seismic waves are generated by earthquakes and they travel through the Earth, interacting with different materials in the interior.
The velocity of these waves changes based on the density of the materials they travel through, allowing scientists to distinguish the properties of Earth's internal layers.
By monitoring seismic waves in different locations and analyzing the wave behavior, scientists can construct a model of Earth's interior, showing liquid and solid layers.