So, when rocks form, the minerals align with the magnetic field preserving its position.
It’s called rock magnetism when rocks record the position of the magnetic field.
The magnetic signature of the rocks allows paleomagnetists to date the rocks and map the position of the field at the time of their formation.
Piecing together the history of Earth’s magnetic field helps us predict its future behavior.
610-425 BC-Philosophers Thales, Anaximander, Pythagoras, Xenophanes and Herodotus propose that marine fossils found inland lived in the sea, and that the now dry land was once underwater. (The myth is probably inspired by remains.) 58 BC-Marcus Aemilius Scaurus displays the skeleton of the "monster of Joppa," said to have a 40-foot backbone and ribs taller than elephants.Earth’s magnetic field also fluctuates in strength every once in a while due to changes in temperature and convection currents at the core.As a member, you'll also get unlimited access to over 55,000 lessons in math, English, science, history, and more.Hot spots are fixed pockets of heat that well up to form volcanic features.Learn how paleomagnetism and the study of hot spots provide evidence that supports the theory of plate tectonics.