Question

Which of the following statements about the Earth's magnetic field is true?

1) Earth's magnetic field is a major driving force for geologic change
2) Earth's magnetic field is always exactly aligned with Earth's axis of rotation
3) The most common magnetic mineral in rocks is quartz
4) Earth's magnetic field protects the Earth from the solar wind and from cosmic radiation
5) Earth's magnetic field is produced from convection in the mantle

Answer 1

The true statement about the Earth's magnetic field is that it protects Earth from solar wind and cosmic radiation, caused by electric currents from the liquid outer core, and not perfectly aligned with the planet's axis.

Step-by-step explanation:

The statement that is true about the Earth's magnetic field is: Earth's magnetic field protects the Earth from the solar wind and from cosmic radiation. The Earth's magnetic field is generated by the movement of liquid metals in the outer core, which creates electric currents and the magnetic field. This magnetic field is not always aligned with Earth's axis of rotation, as the geographic and magnetic poles can differ by about 11.5°. Contrary to the incorrect options, Earth's magnetic field is not a major driving force for geologic change, and the most common magnetic mineral found in rocks is not quartz, but rather magnetite. The field is also not produced by convection in the mantle. The magnetic field is essential for protecting life on Earth by deflecting harmful charged particles from the sun.