The Earth’s Interior Composed of 4 layers Crust Mantle Outer Core
Bellwork (3/24/14) Where is the Earth’s magnetic field produced? The inner and outer core.
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Transcript of Bellwork (3/24/14) Where is the Earth’s magnetic field produced? The inner and outer core.
![Page 1: Bellwork (3/24/14) Where is the Earth’s magnetic field produced? The inner and outer core.](https://reader036.fdocuments.us/reader036/viewer/2022062223/5a4d1b3c7f8b9ab05999ee91/html5/thumbnails/1.jpg)
Bellwork (3/24/14)Bellwork (3/24/14)
• Where is the Earth’s magnetic field produced?
• The inner and outer core.
![Page 2: Bellwork (3/24/14) Where is the Earth’s magnetic field produced? The inner and outer core.](https://reader036.fdocuments.us/reader036/viewer/2022062223/5a4d1b3c7f8b9ab05999ee91/html5/thumbnails/2.jpg)
Magnetic StormMagnetic Storm
• Answer the questions from the video on a separate sheet of paper
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Bellwork (3/25/14)Bellwork (3/25/14)
• How often, on average, does the Earth reverse its magnetic field?
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Bellwork (3/25/14)Bellwork (3/25/14)
• How often, on average, does the Earth reverse its magnetic field?
• About every 200,000 years
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The Dynamic EarthThe Dynamic Earth3/25/143/25/14
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The Earth’s StructureThe Earth’s Structure
• Crust• Mantle• Outer Core• Inner Core
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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
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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
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![Page 10: Bellwork (3/24/14) Where is the Earth’s magnetic field produced? The inner and outer core.](https://reader036.fdocuments.us/reader036/viewer/2022062223/5a4d1b3c7f8b9ab05999ee91/html5/thumbnails/10.jpg)
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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
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How do we know the How do we know the structure of the Earth?structure of the Earth?
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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
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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
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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
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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