25th November 2019

nationalgeographic
15

What is the Geodynamo and what is believed to be the cause of it?

The geodynamo is the mechanism that creates our planet's magnetic field, maintains it, and causes it to reverse. Earth's geodynamo creates a magnetic field that shields most of the habited parts of our planet from charged particles that come mostly from the sun.

What does a negative declination mean?

The direction in which the compass needle points is known as Magnetic North, and the angle between Magnetic North and the True North direction is called magnetic declination or variation. Because the angle to magnetic north is less than true north (360°), this is a negative declination.
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