Society of Physics Students Talk: David Evans, Yale Geology & Geophysics, “Magnetism of ancient rocks: Constraints on Earth’s physical evolution over billions of years”

In this talk I will present research i n my paleomagnetic laboratory, bearing on three major questions of Earth’s evolution: (1) How has the Earth’s magnetic field changed through time? (2) Has plate tectonics always operated with similar styles and rates in the past? (3) Have there been episodes of rapid true polar wander? All three of these geophysical issues have important consequences for long–‐term changes in Earth’s surface environment, including habitability for life.