Shadow Zone Presentation

Multiple Choice

Which of the following statements best describes the difference between P waves and S waves?

• P waves are compression waves that travel fastest, while S waves are shear waves that move slower and shake the ground side to side.

• P waves are slower than S waves and move in a circular motion.

• S waves travel fastest and are compression waves, while P waves are shear waves that move side to side.

• Both P waves and S waves travel at the same speed and have the same motion.

Multiple Choice

Which of the following statements best describes the difference between seismic wave reflection and refraction?

• Reflection occurs when waves bend at a boundary, while refraction occurs when waves bounce off a boundary.

• Reflection occurs when waves bounce off a boundary, while refraction occurs when waves bend as they pass through materials of different densities.

• Reflection and refraction both occur only at the Earth's surface.

• Refraction only happens in the atmosphere, not in the Earth's crust.

Multiple Select

Which of the following factors can cause seismic waves to change speed as they travel through Earth?

• Density of the material

• Temperature of the material

• Presence of water

• Both density and temperature

Open Ended

Explain how changes in both density and temperature within Earth's layers affect the speed and direction of seismic waves.

Fill in the Blanks

The area on Earth's surface where certain seismic waves cannot be detected is called the

zone.

Open Ended

What crucial evidence about Earth's internal structure is provided by the existence of the seismic shadow zone?

Multiple Choice

What is the main difference between P waves and S waves in terms of how they move through the Earth?

• P waves are compression waves that travel fastest, while S waves are shear waves that move slower and shake the ground side to side.

• P waves are slower than S waves and move side to side.

• S waves are compression waves that travel fastest, while P waves are shear waves that move slower.

• Both P waves and S waves move at the same speed and in the same way.