Isogonic lines are the lines joining places of…………………….. .

Options

A. Dip is zero
B. Declination is zero
C. Dip angle is equal
D. Decilination is equal

Answer

To answer the question regarding isogonic lines, we can break down the explanation as follows:

### Step-by-Step Solution:

1. **Understanding Isogonic Lines**:
- Isogonic lines are defined as imaginary lines on a map that connect points on the Earth's surface where the magnetic declination is the same.

2. **Definition of Magnetic Declination**:
- Magnetic declination is the angle between magnetic north (the direction that a compass points) and true north (the direction along the Earth's surface towards the geographic North Pole).

3. **Characteristics of Isogonic Lines**:
- These lines represent areas where the magnetic declination does not change; hence, they are useful for navigation and understanding the Earth's magnetic field.

4. **Visual Representation**:
- On a map, isogonic lines can be drawn to show regions with the same declination. For example, if one line represents a declination of 0 degrees, another might represent a declination of 5 degrees, and so on.

5. **Conclusion**:
- Therefore, isogonic lines are the lines that join places of equal magnetic declination.

### Final Answer:
Isogonic lines are the lines joining places of equal magnetic declination.

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