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Presentation transcript:

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

EARTHQUAKES

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

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

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

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?

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)

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

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.

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

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

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

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

Review Video https://www.youtube.com/watch ?v=lcVwAn8W-jo#t=202