[" 2.At a point "A" on the earth's surface the angle of dip,"],[delta=+25^(@)" .At a point "B" on the earth's surface the "],[" angle of dip,"delta=-25^(@)." We can interpret that: "],[[" (1) "A" and "B" are both located in the northern "],[" (2) "A" is located in the nothern hemisphere and "B],[" (2) "A" is located in the northern hemisphere and "B],[" is located in the southern hemisphere."],[" (4) "A" and "B" are both located in the southern "],[" hemisphere."]]