At a point $A$ on the earth’s surface the angle of dip, $\delta =+25^{\circ }$. At a point $B$ on the earth’s surface the angle of dip, $\delta =-25^{\circ }$. We can interpret that:

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