GEOLOGY

Detailed explanation-1: -The best proof is to use a direction compass to see where the north position points, and you will notice that it always points to the north and south poles. Hence, the correct answer is option B.

Detailed explanation-2: -Earth’s Core We can use compasses to show the direction of Earth’s magnetic field. This also shows that Earth has a magnetic field since the compasses align themselves with Earth’s field. The needle of a compass points to the North pole. This means that this is Earth’s magnetic South pole.

Detailed explanation-3: -Answer: Magnetic fields around planets behave in the same way as a bar magnet. On Earth, flowing of liquid metal in the outer core of the planet generates electric currents. The rotation of Earth on its axis causes these electric currents to form a magnetic field which extends around the planet.

Detailed explanation-4: -Evidence for the presence of a magnetic field is the magnetic force on charges moving in that field; the force is at right angles to both the field and the velocity of the charge. This force deflects the particles without changing their speed.