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Contents of 10.4 How do we know ... Earth's core is a dynamo?

• Computer-simulation results, which include most, but not all of the interpreted complexity of core processes, are consistent with the geodynamo hypothesis.
• The Glatzmaier-Roberts simulations not only reproduce the key features of the observed magnetic field at the surface, but also generate simulated polarity reversals.
• The computer output suggests that magnetic-field-polarity reversals are caused by complex interactions between the outer and inner cores.

10.4 How do we know ... Earth's core is a dynamo?