The earth's magnetic poles have swapped places a number times. What are these shifts called? What type of scientist typically studies them? How are they detected? I

the scientist is called GALLET

Explanation:

Yves Gallet balanced on a steep rocky slope in northeast Siberia, a turquoise river leisurely wending across the undulating landscape that sprawled below. But Gallet, of France’s Institut de Physique du Globe de Paris, had his face turned toward the rocks with one goal in mind: deciphering the history of Earth’s magnetic field.