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

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