© La Cité/CNRS Audiovisuel/Institut Physique du globe 1998

Mysterious island

Reference

297

Duration

00:16:00

Production year

1998

Versions

Original material

SD
4/3
Color
Sound

Résumé

The center of the earth is essentially composed of molten iron. The rotation of the earth produces movement in this molten mass which conducts electricity, thus generating the earth's magnetic field. Scientists have established that this magnetic field has frequently reversed itself over time. Ancient lava flows provide very valuable evidence for the history of the earth's magnetic field and for continental drift.

Scientific topics

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