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Making the Pieces Fit: Confirming the Theory of Plate Tectonics
02:24

Making the Pieces Fit: Confirming the Theory of Plate Tectonics

The theory of plate tectonics was initially accepted largely on the basis of indirect, paleomagnetic data. Eventually, however, it was confirmed through the use of GPS technology, which is able to actually measure plate motion.

Over the Edge: Exploring the Deep Ocean Floor
07:41

Over the Edge: Exploring the Deep Ocean Floor

Scientists have made great progress in their efforts to map the deepest parts of the ocean. But even with all the new technology that's available, our knowledge and understanding of the deep ocean is far from complete. In fact, we know more about th...

Over the Edge: Oceanic Ridge System, The
01:42

Over the Edge: Oceanic Ridge System, The

Perhaps the most striking feature that characterizes the deep ocean floor is the vast oceanic ridge system that encircles the Earth along tectonic plate boundaries.

Over the Edge: Deep Ocean Floor, The
00:58

Over the Edge: Deep Ocean Floor, The

Although it comprises more than half of Earth's surface area, the deep ocean floor was a region of near total mystery until fairly recently. Even now, efforts to map ocean basins are in their infancy.

World in Motion: Seamounts, Guyots and Island Arcs
02:56

World in Motion: Seamounts, Guyots and Island Arcs

Seamounts, guyots and island arcs form on the ocean floor as a result of a hot spot or mantle plume. While seamounts do not extend above the ocean surface, a guyot is tall enough to be eroded by wave activity and therefore has a flat top. An island ...

World in Motion: Plate Boundaries and Plate Movement
06:32

World in Motion: Plate Boundaries and Plate Movement

Whether studying earthquakes, volcanoes, or other geologic events, scientists usually focus their attention on plate boundaries and plate movement.

World in Motion: Heat, Convection and Plate Tectonics
05:54

World in Motion: Heat, Convection and Plate Tectonics

Most scientists believe heat and convection probably play a major role in plate tectonics. And, yet, many questions remain.

World in Motion: Earthquakes and Plate Tectonics
02:05

World in Motion: Earthquakes and Plate Tectonics

With the advent of plate tectonics, it's become apparent that episodes of extreme geologic upheaval--like earthquakes--are much more than simply random events.