Bellwork (3/24/14)Bellwork (3/24/14)

• Where is the Earth’s magnetic field produced?

• The inner and outer core.

Magnetic StormMagnetic Storm

• Answer the questions from the video on a separate sheet of paper

Bellwork (3/25/14)Bellwork (3/25/14)

• How often, on average, does the Earth reverse its magnetic field?

Bellwork (3/25/14)Bellwork (3/25/14)

• How often, on average, does the Earth reverse its magnetic field?

• About every 200,000 years

The Dynamic EarthThe Dynamic Earth3/25/143/25/14

The Earth’s StructureThe Earth’s Structure

• Crust• Mantle• Outer Core• Inner Core

Earth’s MagnetismEarth’s Magnetism• The liquid iron

outer core flows around the solid inner core

• This gives it a dynamo effect

• The cause of earth's magnetism

Earth’s Magnetic PolesEarth’s Magnetic Poles

• The south magnetic pole is located in the north geographic region

• The north magnetic pole is located in the south geographic region

Earth’s Magnetic FieldEarth’s Magnetic Field

• Deflects most of the cosmic ray’s• Reverse polarity about every 200,000

years• Last reversal was about 780,000 years

ago

How do we know the How do we know the structure of the Earth?structure of the Earth?

Earthquakes and Seismic Earthquakes and Seismic WavesWaves

• P-Waves are longitudinal waves that can go through solids and liquids

• S-Waves are transverse waves that can only go through solids

Seismic Wave AnimationSeismic Wave Animation

• https://www.youtube.com/watch?v=JQ27PNRe4zA

• http://neic.usgs.gov/neis/eq_depot/2002/eq_021103/ak_seismic_waves.html

Science Fiction StoryScience Fiction Story

• Story needs to be 600 words minimum• What would it be like to live through a

magnetic reversal• Due Dates:• - Rough Draft due Tues. 4/1/14• - Final Draft and Reviews due Tues. 4/8/14

This Week’s AgendaThis Week’s Agenda

• Today – Brainstorm or start rough draft of the Science Fiction Story

• Tomorrow – Start the Magnetism Lab• Thur. – Finish the Magnetism Lab• Fri. – Post Lab and magnetism notes