Pages 40-46 Notes

• Paleomagnetism - The natural remnant magnetism in rock bodies.
• Earth's magnetic field is similar to that produced by a simple bar magnet.
• Iron-rich materials are abundant in lava flows of basaltic composition.
• Earth's magnetic field causes a dip needle to align with the lines of magnetic force.
• Polar wandering - The magnetic poles had migrated through time.
• One of the segments of this interconnected feature extends down the middle of the Atlantic Ocean and hencewas named the Mid-Atlantic Ridge.