A recent study published in the journal Science on October 1, 2026, and reported by Scientific American, suggests that the Earth's solid surface has tilted as a single block multiple times since the age of the dinosaurs. This tilting has caused certain continents to submerge while others have risen above the water. The phenomenon is still ongoing today, with the Earth's crust moving approximately 10 centimeters per year. Four major tilting events have been identified, occurring roughly 200, 150, 100, and between 30 and 20 million years ago. This process, known as "true polar wander," differs from continental drift, which involves the movement of rigid plates on the Earth's upper mantle. Continental drift, first proposed by Alfred Wegener in 1912, describes the slow movement of landmasses due to convection currents in the mantle, with speeds ranging from 1.3 to 10 centimeters per year. In contrast, "true polar wander" involves the entire solid mass of the Earth—its crust and mantle—shifting relative to the Earth's axis of rotation. This movement is likened to an orange rolling on a table, rather than a peel cracking into pieces. As a result, continents can rapidly cross different climate zones, while their relative positions to each other remain largely unchanged. Until now, the most reliable evidence for these tilts came from magnetic signals recorded in ancient rocks. However, these data are rare and often inconclusive. To address this, Mathew Domeier, a geoscientist at the University of Oslo and lead author of the study, and his team used a different approach. They analyzed maps showing which areas were above or below sea level in slices of 10 million years. The Earth's rotation causes rock to swell at the equator, similar to how water bulges. When the solid block tilts, it moves through this bulge, causing parts of continents to rise or fall. This creates a distinct pattern on the maps resembling a four-leaf clover, appearing around 200, 150, and 100 million years ago, and again between 30 and 20 million years ago. The clearest signal of this movement was observed between 150 and 140 million years ago, a period where magnetic data also suggested rapid displacement. This coincidence has led geologist Giovanni Muttoni of the University of Milan to describe the study as offering an independent test of the phenomenon. Domeier admits the results surprised him, noting that the current displacement of 10 centimeters per year is primarily driven by the melting of glacial caps. This melting redistributes mass on the Earth, causing the solid layers to shift in response. While the exact triggers for these tilting events remain unknown, researchers agree that understanding why they occurred at these specific times is the next logical step. For now, satellite measurements provide more precise data, but whether this movement signals a new large-scale episode remains uncertain.