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thermoremanent magnetization

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thermoremanent magnetization [¦thər·mō′rem·ə·nənt ‚mag·nəd·ə′zā·shən]
(geophysics)
The permanent magnetization of igneous rocks, acquired at the time of cooling from the molten state.


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Geophysicists have long used this leftover magnetization, called thermoremanent magnetization (TRM), as a tool to trace changes in the earth's magnetic field and as a yardstick to measure the drift of the continents.
 
 
 
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