At a point A on the earth's surface of angle of dip, `delta=+25^(@)`. At a point B on the earth's surface the angle of dip, `delta=-25^(@)`. We can interpret that.

Options

A. A and B are both located in the southern hemisphere.
B. A and B are both located in the northern hemisphere.
C. A is located in the southern hemisphere and B is located in the northern hemisphere.
D. A is located in the northern hemisphere and B is located in the southern hemisphere.

Explanation

To solve the problem, we need to analyze the given angles of dip at points A and B on the Earth's surface.

### Step-by-Step Solution:

1. **Understanding the Angle of Dip**:
- The angle of dip (denoted as δ) is the angle made by the Earth's magnetic field with the horizontal plane.
- A positive angle of dip indicates that the magnetic field is directed downward into the Earth, while a negative angle indicates that the magnetic field is directed upward away from the Earth.

2. **Analyzing Point A**:
- At point A, the angle of dip is given as δ = +25°.
- According to the convention, a positive angle of dip indicates that point A is located in the Northern Hemisphere.

3. **Analyzing Point B**:
- At point B, the angle of dip is given as δ = -25°.
- A negative angle of dip indicates that point B is located in the Southern Hemisphere.

4. **Conclusion**:
- From the analysis, we conclude that point A is in the Northern Hemisphere and point B is in the Southern Hemisphere.

Thus, the correct interpretation is that **A is located in the Northern Hemisphere and B is located in the Southern Hemisphere**.