featured geophysics video

Continents Adrift: Plate Tectonics

Seafloor spreading can create new ocean crust, but the crust must be destroyed somewhere as well. Earthquake locations mapped in studies could be "connected" to show that the Earth's crust was broken into many tectonic plates.


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How Big is the Earth?

How Big is the Earth? (1:43)

How big is the Earth? Find out in this HowStuffWorks video!

Sir Martin Rees Talks About Earth

Sir Martin Rees Talks About Earth (18:11)

Watch this video showing how the Earth works on HowStuffWorks. Cosmologist Sir Martin Rees explains why the 21st century is a unique and pivotal century not just for mankind but for the entire planet. Learn about how the Earth works in this video... More »

Thailand Could Sink Into the Ocean

Thailand Could Sink Into the Ocean (1:22)

Watch this video to see how global warming and flooding are combining to sink Thailand underwater. Experts say Bangkok is steadily sinking because of the amount of ground water pumped out from beneath it while some villages on the coast are already... More »

Sketches of the World: Introduction to Nature

Sketches of the World: Introduction to Nature (2:08)

The natural world contains many different landscapes and life forms. Mountains are some of the most visible landscapes, but many other landscapes also exist.

Life in the Desert: Interactions Among Species

Life in the Desert: Interactions Among Species (3:55)

Desert plants and animals form relationships with others that share their habitat to form a biological community. A keystone species is a species that dominates an ecosystem in numbers and in its importance to other species.

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100 Greatest Discoveries: The Center of the Earth

100 Greatest Discoveries: The Center of the Earth (1:27)

Learn about the center of the Earth on The Science Channel's "100 Greatest Discoveries."

100 Greatest Discoveries: Earth's Magnetic Field

100 Greatest Discoveries: Earth's Magnetic Field (2:34)

Bernard Brunhes' study of volvanic eruptions led to the discovery of the Earth's magnetic field reversal. Learn more about Brunhes' findings on the Science Channel's "100 Greatest Discoveries."

100 Greatest Discoveries: The Core of the Earth

100 Greatest Discoveries: The Core of the Earth (2:39)

On the Science Channel's "100 Greatest Discoveries," take an in depth look at our planet with host Bill Nye, as he examines the Earth's inner and outer core.

Exploring Time: The Carbon Cycle

Exploring Time: The Carbon Cycle (2:44)

On the Science Channel's "Exploring Time," discover how the carbon cycle works and how carbon moves from plants, to the air, to the water and back.

Mountains: The Cycle of Mountain Building

Mountains: The Cycle of Mountain Building (1:24)

Heat and pressure will cause chemical and physical changes in a mountain's sediment layers.

Mountains: Plate Tectonics

Mountains: Plate Tectonics (2:07)

Plate tectonics describes large-scale movements that occur under the earth's crust, which is divided into about a dozen large sections called plates. Where two plates meet, it is common to have earthquakes.

Mountains: Introduction to Mountain Building

Mountains: Introduction to Mountain Building (0:48)

The world's mountains were created by a variety of forces. Even today, mountains are still growing.

Earth Science: Magnetic Field Reversal

Earth Science: Magnetic Field Reversal (2:54)

The theory of magnetic field reversal states that in the near future, the Earth's magnetic field will reverse itself or will become disoriented, so, for example, there may be several north poles. Learn more about magnetic field reversal in this... More »

Earth Science: Plate Tectonics

Earth Science: Plate Tectonics (4:22)

Plate tectonics is a relatively new theory that combines and unifies the previous theories of continental drift and seafloor spreading. Plate Tectonics is the process by which the plates of the Earth move, and in so doing, change size and shape.

Earth Science: The Spreading Seafloor

Earth Science: The Spreading Seafloor (4:01)

As the Earth's plates continue to move, cracks in the seafloor occur, and magma seeps out. As this new magma cools, it becomes and expands the seafloor. Learn more about seafloor expansion in this video.