According to Scientist 1, which of the following assumptions about the source of the Earth’s magnetic field is a major flaw in Scientist 2’s theory?
A. The iron in the inner core possesses no magnetic properties.
B. The iron in the liquid outer core possesses ferromagnetic properties.
C. The outer core can conduct electricity.
D. The magnetic field shields the Earth from solar wind.

Scientist 1
The Earth’s magnetic field is similar to that of a bar magnet tilted 11 degrees from the spin axis of the Earth. The magnetic field of a bar magnet, or any other type of permanent magnet, is created by the coordinated motions of electrons within iron atoms. It is widely accepted that the Earth’s core consists of metals. The inner core is 70% as wide as the moon and consists of a solid iron ball, which would exhibit properties of ferromagnetism (the natural magnetic tendency of iron). The core has its own rotation and is surrounded by a “sea” of molten rock. The magnetic field grows and wanes, and the Earth’s poles drift and occasionally flip as the rotation of the core changes. The poles of the magnetic field have “flipped” many times due to the fluctuations in the rotation of the solid inner core. Other fluctuations in the magnetic field that can occur on a daily basis are largely the result of interference by solar wind.