What Makes Earth’s Magnetic Field Change Direction?

The video explores Earth's magnetic field reversals, explaining the Dynamo theory and the role of Earth's core. It discusses how scientists study these changes using volcanic rocks and the potential link between plate tectonics and field reversals. Recent research suggests a pattern between subduction and reversals, with randomness in the process. The video concludes that Earth's magnetic field can reverse without external triggers like asteroids.

What is the primary source of Earth's magnetic field according to the Dynamo theory?

• The inner core

• The Earth's crust

• The movement of iron in the outer core

• The Earth's atmosphere

How do scientists use volcanic rocks to study past magnetic fields?

• By studying the rock's color

• By observing the alignment of iron particles

• By analyzing the chemical composition

• By measuring the temperature of the rocks

What is the average frequency of Earth's magnetic field reversals?

• Every few billion years

• Every few million years

• Every few hundred thousand years

• Every few thousand years

Which geological process is hypothesized to influence magnetic field reversals?

• Tsunamis

• Plate tectonics and subduction

• Volcanic eruptions

• Earthquakes

What recent finding suggests a delay between subduction and magnetic field reversals?

• A delay of 30 million years

• A delay of 60 million years

• A delay of 120 million years

• A delay of 300 million years