What are isogonic, isoclinic and isodynamic lines?

Explanation

To understand the concepts of isogonic, isoclinic, and isodynamic lines, we can break down the definitions and characteristics of each type of line step by step.

### Step-by-Step Solution:

1. **Isogonic Lines**:
- Definition: Isogonic lines are lines on a map that connect points of equal magnetic declination.
- Explanation: Magnetic declination is the angle between magnetic north (the direction a compass points) and true north (the direction of the geographic North Pole). Isogonic lines help in understanding how the magnetic field varies across different locations on Earth.

...