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The inclination of Earth's magnetic field relative to the horizontal is referred to as the angle of dip. How does this angle vary across different regions?

1. The dip angle is positive.
2. The dip angle is negative.
3. The dip angle is zero at the equator, positive in the Northern Hemisphere, and negative in the Southern Hemisphere.
4. No valid statement about the angle of dip is provided.

Correct answer: The dip angle is zero at the equator, positive in the Northern Hemisphere, and negative in the Southern Hemisphere.

Solution

The angle of dip is zero at the equator because the Earth's magnetic field is horizontal there. In the Northern Hemisphere, the magnetic field points downward, making the dip positive, while in the Southern Hemisphere, it points upward, making the dip negative.

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