1. Homebase 1) Come in quietly!
2) If you have your report card envelopes, turn those in
3) You may either read or work on another assignment

2. EARTHQUAKES

3. Class Opener
Complete the terms “matter” and “vocal cords” on your vocabulary list
Vocal Cords: 2 pairs of elastic membrane; produce sound
Matter: a medium that sound can travel through

4. Page 17 Set Up
- Write the EQ (EQ: How do seismic waves compare to sound and light waves?)
-Title (from your TOC)
- Page #
- Today’s date
- Write your homework in your agenda when you are finished

5. Foldable Set-Up
Wait for further instructions on how to set up your foldable for today

6. Intro to Earthquakes Video
Video Opener
Watch this short video.
Intro to Earthquakes Video
After viewing, discuss this question with your group: Why is it so important to understand earthquakes?

7. What are Earthquakes?
- Earthquakes = vibrations of rock in the Earth’s crust
- They are caused by the release of potential energy (total energy stored in rocks below the surface of the earth)

8. - Earthquake waves are known as seismic waves
- They carry energy away from the focus through earth and across the surface of the Earth.

9. Parts of the Earthquake:
Focus – the area underground where rock breaks causing an earthquake.
Epicenter – the point on earth’s surface directly above the focus.

11. Earthquake Waves are called seismic waves.
3 Types of Seismic Waves
Primary (P) Waves
Secondary (S) Waves
Surface Waves

12. P-Waves (Primary Waves)
First waves to arrive
Move forward and
back along the path of the
wave (similar to a longitudinal wave)
Can damage buildings
Can move through solids and liquids

14. S-Waves (Secondary Waves)
Arrive after P-waves
Move side-to-side and up-and- down (similar to a transverse wave)
Shake structures violently
Can only move through solids

16. Surface Waves S and P waves combine to create surface waves
Slowest of seismic waves and the most dangerous
Move like both transverse and longitudinal waves

17. Review Video
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