Earth Revealed: Introductory Geology

Episodes

The first episode, "Down to Earth," compares surface conditions on Venus and Mars with Earth's living landscapes to underscore Earth's uniqueness, then outlines the goals of geology and introduces major topics such as heat engines, plate tectonics, volcanism, earthquakes, seismology, erosion, and groundwater. "The Restless Planet" covers the development of astronomical theory from ancient Greek geocentrism through Copernicus, Galileo, Kepler, and Newton, and describes the Solar System's formation, Earth's physical evolution via planetary differentiation, and the emergence of its internal heat engine, atmosphere, hydrosphere, and life.

"Earth's Interior" introduces geophysics, explaining how scientists study subsurface structures using seismic waves, temperature variations, magnetic fields, gravity, and computer simulations, and discusses paleomagnetism and magnetic field reversals. "The Sea Floor" details methods for studying the ocean bottom, including research submersibles and indirect techniques, and examines features like the continental shelf, continental rise, slopes, canyons, abyssal plains, mid-ocean ridges, subduction, seafloor spreading, hydrothermal vents, and metallic resources.

"The Birth of a Theory" traces plate tectonics from Alfred Wegener's early 20th-century work through its acceptance in the 1960s, covering Pangaea, continental drift, seafloor spreading, subduction trenches, paleomagnetism, magnetic field reversals, transform faults, and mantle convection.