GEOLOGY

Detailed explanation-1: -Magnetic field lines spread out from one pole, curve around the magnet, and return to the other pole. The lines form complete loops from pole to pole and never cross. Arrows are used to indicate the direction of the magnetic field lines-always leaving the north pole and entering the south pole.

Detailed explanation-2: -Magnets have two poles; the field lines spread out from the north pole and circle back around to the south pole.

Detailed explanation-3: -Magnetic field lines are closed curves leaving from North pole and entering the South pole when you follow them on the outside the magnet.

Detailed explanation-4: -Magnetic field lines in a bar magnet start from the north pole and end at the south pole. The direction of the magnetic field is tangential to the field line at all points in space. The field lines do not intersect each other. The field lines form closed loops.