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In hot Iron bearing rocks or magmas the iron minerals they contain align themselves parallel to the Earth's magnetic field. When they cool below about 500 degrees Celsius the the iron minerals 'freeze' in this magnetic orientation and are no longer able to adapt to any changes in the Earth's field (which occasionally reverses polarity and wanders). This frozen magnetic alignment is a fossil of the ancient magnetic field and can be 'read' to find out what the Earth's magnetic field has been doing in the past.
Wiki User
∙ 14y ago
Wiki User
∙ 11y agoIt refers to molten rock which aligned with the then-current magnetic field of Earth and then solidified, "locking in" that orientation. This is how scientists know that the Earth's magnetic field has switched directions before (we don't really know why, though).
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The Latin translation for Magnetism is Magnetismus.
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What is the magnetism of Quartz?
The magnetism of a quartz is 3.56
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How do you test magnetism?
repulsion is the sure test of magnetism. Narahari.D
What is the sure test of magnetism?
The sure test of magnetism is REPULSION .
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