Magnetism: Earth's Magnetic Field

The video explains Earth's magnetic field, comparing it to a bar magnet with strong northern and southern poles. Scientists theorize its origin is linked to iron and nickel in the outer core. The magnetic field guides compass needles north.

What is one of the mysteries scientists face regarding the Earth's magnetic field?

• Its exact origin

• Its strength

• Its direction

• Its location

What does the Earth's magnetic field cause a compass needle to do?

• Point in a southerly direction

• Point in a northerly direction

• Spin around

• Stay still