The angle which are total magnetic field of earth makes with the surface of the earth is called

Options

A. declination
B. magnetic meridian
C. geographic meridian
D. inclination

Answer

To solve the question regarding the angle that the total magnetic field of the Earth makes with the surface of the Earth, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Magnetic Field**: The Earth's magnetic field can be represented as a vector that has both vertical and horizontal components. The vertical component points downwards towards the center of the Earth, while the horizontal component lies parallel to the surface of the Earth.

2. **Identifying the Components**: At any given point on the Earth's surface, the total magnetic field can be broken down into:
- A vertical component (pointing downwards)
- A horizontal component (parallel to the surface)

3. **Defining the Angle**: The angle that the total magnetic field makes with the horizontal surface of the Earth is what we are interested in. This angle is typically denoted as θ.

4. **Naming the Angle**: The angle θ is known as the angle of dip or inclination. It is the angle between the total magnetic field vector and the horizontal plane.

5. **Conclusion**: Therefore, the angle which the total magnetic field of the Earth makes with the surface of the Earth is called the angle of dip or inclination.

### Final Answer:
The angle which the total magnetic field of the Earth makes with the surface of the Earth is called the **angle of dip** (or **inclination**).

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