Understanding Earth's Magnetic Field Reversals

What is the current orientation of Earth's magnetic field?

• Magnetic south is the south pole

• Magnetic south is the north pole

• Magnetic north is the south pole

• Magnetic north is the north pole

Approximately how long ago did the last magnetic pole reversal occur?

• 780,000 years ago

• 1.1 million years ago

• 41,000 years ago

• 100,000 years ago

What geological evidence helps scientists understand the history of Earth's magnetic field?

• Sediment layers

• Fossil records

• Iron in solidified lava

• Carbon dating of rocks

What phenomenon generates Earth's magnetic field?

• Gravitational pull of the moon

• Electromagnetic induction in the outer core

• Rotation of the Earth

• Solar winds

What could be a consequence of a magnetic field reversal?

• Sudden shift in Earth's orbit

• Complete loss of gravity

• Increased radiation affecting satellites and electronics

• Instant reversal of ocean currents

How often have magnetic field reversals occurred in Earth's history?

• Only twice

• Thousands of times

• Ten times

• At least a hundred times

What is one reason why predicting the next magnetic field reversal is challenging?

• Predictable patterns are observed

• Reversals occur at regular intervals

• Scientists fully understand the core's dynamics

• Lack of historical data

What is NOT a potential cause of magnetic field reversals mentioned in the text?

• Magma movements in the mantle

• Human activity

• Tectonic plates moving

• Asteroids impacting Earth