6.10 The Earth's Magnetic Field (Chapter 6: Earth's Structure: Direct and Indirect Evidence)
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Course
AS Unit F791 - Global Tectonics
Institution
OCR
This document contains detailed notes on The Earth's Magnetic Field from Chapter 6: Earth's Structure: Direct and Indirect Evidence of the A Level Geology course. It includes all the information required to secure a top grade in this part of the course. These notes took me many hours to complete an...
, The Earth’s Magnetic Field
• Ancient mariners used needles of lodestone (now known as
magnetite (Fe₃O₄)) as compasses to as it aligns itself in the north
south direction.
• In 1600, William Gilbert noted that the Earth behaves ‘like a giant
magnet’. Its field is represented using a bar magnet along the axis of
the Earth’s rotation.
• The needle lies vertical at the magnetic poles and horizontal at the
equator.
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