EARTH SCIENCE
MAGNETISM
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
When electric currents flow, magnetic fields form.
|
|
|
Earth’s magnetic poles are aligned with Earth’s rotational axis.
|
|
|
Earth’s rotation produces an electric current that flows through Earth’s outer core.
|
|
|
Earth’s magnetic field forms as a result of the electric current flowing through the outer core.
|
Detailed explanation-1: -Correct Answer: The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to the north.
Detailed explanation-2: -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-3: -Earth’s mid-ocean ridges, where tectonic plates form, provide paleomagnetists with data stretching back about 160 million years. As lava continually erupts from the ridges, it spreads out and cools, and the iron-rich minerals in it align with the geomagnetic field, pointing north.
Detailed explanation-4: -Answer: The Earth’s core contains conductive material, such as iron, that when exposed to an electric current can produce magnetic fields.