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At a point A on the earth’s surface the angle of dip, δ = +25°. At a point B on the earth’s surface the angle of dip, δ = -25°. We can interpret that:

1. A and B are both located in the northern hemisphere.
2. A is located in the southern hemisphere and B is located in the northern hemisphere.
3. A is located in the northern hemisphere and B is located in the southern hemisphere.
4. A and B are both located in the southern hemisphere.

Correct answer: A is located in the northern hemisphere and B is located in the southern hemisphere.

Solution

The angle of dip is positive in the northern hemisphere and negative in the southern hemisphere. Since δ = +25° at A, it indicates A is in the northern hemisphere, and δ = -25° at B indicates B is in the southern hemisphere.

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