The surface of the Earth is not one solid shell. It is into large pieces tectonic plates, move a few centimeters year. Where two meet, the ground can . of the world’s earthquakes and are found these boundaries.

Around the edge of the Pacific Ocean lies a chain of volcanoes known as the Ring of Fire. three quarters of the world’s volcanoes are there. The ring produces of the earthquakes ever , the 1960 earthquake in Chile, the ever .

In 1912, the German scientist Alfred Wegener proposed a bold idea: the continents had once been joined together in a single huge landmass and had slowly drifted apart. He pointed out that the coastlines of South America and Africa fit together like pieces of a puzzle, and that the same fossils and types of rock appear on both sides of the Atlantic Ocean.

Most geologists rejected the theory. Wegener’s evidence was interesting, but he could not explain what force was strong enough to move entire continents. Without a mechanism, the idea seemed impossible.

The situation changed in the 1950s and 1960s, when new technology allowed scientists to map the ocean floor. They discovered long underwater mountain ranges where new crust was forming and spreading outward. Rocks on either side of these ridges recorded the same magnetic patterns, like mirror images.

These findings provided the missing mechanism. Continents did not plough through the ocean floor, as Wegener had imagined; instead, they rode on moving plates. By the late 1960s, plate tectonics had become the foundation of modern geology, more than thirty years after Wegener’s death in 1930.

Every major earthquake brings the same question: why did no one warn us? The honest answer is that scientists still cannot predict the exact time, place and size of an earthquake. What they can do is forecast probabilities. By studying past earthquakes and measuring how much strain is building along a fault, they can estimate the chance of a large earthquake in a region over several decades.

Some countries also use early warning systems. These do not predict earthquakes; they detect one that has already begun. Because electronic signals travel faster than seismic waves, a warning can reach a city seconds before the strongest shaking arrives. Japan’s system, for example, can automatically slow down high-speed trains and send alerts to mobile phones.

A few seconds may not sound like much. Yet it is enough time for people to take cover, for surgeons to stop operating and for factories to shut down dangerous machines. In earthquake science, small gains in time can save many lives.