Question

each wave type moves through materials differently. waves can also reflect, or bounce off boundaries between different layers of the earth. the waves can also bend, or refract, as they pass from one layer into another. scientists learn about earths composition by studying the paths and speeds of seismic waves traveling through earth.
questions

1. as seismic waves move through the earth, p - waves change the volume of the material they go through and s - waves change the shape of the material. which type of wave do you think goes through the earth faster? (think about the movement of the atoms)

explain your answer

1. how can seismic waves be used to map the earths interior?

Explanation:

Step1: Recall properties of P - and S - waves

P - waves are compressional waves that can travel through solids, liquids, and gases. S - waves are shear waves that can only travel through solids.

Step2: Consider Earth's interior composition

The outer core of the Earth is liquid. Since S - waves cannot travel through liquids, P - waves will travel faster through the Earth because they can traverse both solid and liquid layers while S - waves are blocked by the liquid outer - core.

Step3: Answer the first question

P - waves travel faster through the Earth.

Step4: Answer the second question

Seismic waves can be used to map the Earth's interior. When seismic waves travel through the Earth, they change speed and direction at the boundaries between different layers. By studying the arrival times and paths of these waves at seismographs around the world, scientists can infer the structure and composition of the Earth's interior, such as the location of the crust - mantle boundary, the outer - core, and the inner - core.

Answer:

1. P - waves travel faster through the Earth because S - waves cannot pass through the liquid outer core while P - waves can travel through both solids and liquids.
2. Yes, seismic waves can be used to map the Earth's interior. By analyzing the arrival times and paths of seismic waves at seismographs, scientists can infer the structure and composition of different layers within the Earth.