Why does Earth have magnetic poles?
Show answer & explanation
Answer: Molten iron core circulation
Molten iron core circulation ✓ — Correct! Earth's outer core is molten iron and nickel. As Earth rotates, convection currents flow through this liquid metal, generating electric currents. These currents create Earth's magnetic field (geodynamo effect). The magnetic poles don't align exactly with geographic poles and even flip every 200,000-300,000 years!
Frozen magnetic rocks — Wrong. Rocks can preserve magnetic signatures but don't generate the field. Earth's magnetism comes from circulating liquid metal in the core.
Solar wind creates field — Wrong. Solar wind interacts with Earth's magnetic field (creating auroras), but the field itself is generated internally by core dynamics.
Go deeper: Magnetic pole reversal
Play today's quiz — new questions dailyMore Earth Science questions
- Why can a river turn orange downstream even if the strongest acidic water enters from one tiny spring along the bank?
- Why might two Arctic streams look similarly rusty but need different chemical diagnoses?
- Why can thawing permafrost make a stream more acidic instead of simply adding cold meltwater?
- In folded Appalachians, why can one rock layer become a ridge while its neighbor becomes a valley?
- Why do some fresh earthquake fault scarps become rounded faster than others?
- Why can a long active fault affect more river basins than a short one?