1. Magnetism & Electromagnetism
Magnet Earth
Chapter 1
Section 2

2. Earth’s Magnetic Field
Just like a magnet
Due to molten metal circulating in the core of the earth
Iron
Nickel

3. Compass A devise with a magnetized needle that can spin freely
Needle aligns with Earth’s magnetic field

4. Two Types of Poles Geographic “True” Poles Magnetic Poles
Perpendicular to equator
Rotation of earth
Magnetic Poles
Magnetic field

5. Magnetic Declination
The difference in angle between the direction towards the Geographic & Magnetic poles.

6. Changing Magnetic Pole
From 1580 to 1820 the Magnetic Declination for a sailor in London changed 35 degrees

7. Magnetosphere Protects the earth from solar winds
Electrically charge particles in space

8. Aurora Borealis Australis
Northern Lights
Australis
Southern Lights
Solar winds interact with atoms in earth’s atmosphere
Atoms release light

9. Earth Creates Magnets Because Earth is a magnet, it can create magnets
Over many years, large metal objects can become magnetized by the earth if they are left undisturbed
E.g. file cabinets

10. Mid-Atlantic Ridge Earth’s Magnetic Reversals
Roughly every 200,000 years
Not yet understood