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Explore the dynamic nature of Earth's continents and oceans in this 57-minute lecture from The Royal Institution's 1995 Christmas Lectures series. Discover how our planet's surface appears alive when viewed from space, with continents and oceans constantly rearranging themselves over geological time scales. Learn about the revolutionary scientific discovery of plate tectonics and how new instruments designed for precise measurements led to understanding the movement of Earth's plates at rates of a few centimeters per year - slow by human standards but rapid enough for plates to circle the Earth ten times during the planet's lifetime. Examine how the oceans, rather than the continents, hold the key to understanding Earth's history through magnetic records as precise as tree rings or bar codes. Understand how modern satellite technology now allows scientists to measure plate motions directly at millimeter-per-year precision, and explore the challenges that remain in defining plate boundaries on continents and explaining the source of volcanic material. Gain insight into how catastrophic events like volcanic eruptions and earthquakes, while disasters to humans, are natural expressions of vigorous motions deep inside the Earth that reveal our planet is far from a dead rock in space but rather a dynamic, jelly-like system in constant motion.
