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

Reference

297

Mysterious island

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.

Duration

00:16:00

Production year

Définition

SD

Color

Color

Sound

Sound

Version(s)

French

Original material

video Beta SP

Production

Scientific topics

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