Booming Sands

This video segment, adapted from NOVA scienceNOW, presents basic concepts of physics behind "booming" sand dunes. See how surface tension affects potential and kinetic energy and how it all works together to create sound.

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Caves and Karst

This interactive resource adapted from the National Park Service presents the key concepts of cave and karst systems, including how and where they form, different types, and various cave environments.

Coastal Geological Materials

This interactive resource adapted from the National Park Service describes the different kinds of sediments that make up coastlines, with a focus on the variety in color, size, and sorting.

Earthquakes: The Prehistoric Record

In this video segment adapted from NOVA, a geologist digs a trench along the San Andreas Fault to reveal three thousand years of earthquake history. Information from the layers of sediment may help geologists to predict earthquakes.

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Fossils

Fossils are indicators of past life. This collection of still images produced for Teachers' Domain features examples of fossils from plants, animals, and insects.

The Grand Canyon: Evidence of Earth's Past

In this video segment adapted from NOVA, a fossil found among the Grand Canyon's rock layers reveals the existence of a shallow sea that once covered most of western North America.

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The Grand Canyon: How It Formed

This video segment adapted from NOVA uses animation to present the theory of how the Grand Canyon was formed and features rare footage of a phenomenon known as debris flow.

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The Grand Canyon: Its Youngest Rocks

This video segment adapted from NOVA features the youngest rock formations in the Grand Canyon, lava dams, and how they are subject to the eroding power of water.

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How Caves Form

This interactive activity from NOVA Online shows four different ways in which caves are formed: by rainwater, waves, lava, and bacteria.

The Mississippi River Delta

These images from NASA, the Lunar and Planetary Institute, and U.S. Geological Survey illustrate the effects of severe storms and decades of river management on the size and shape of the Louisiana coastline and the Mississippi River Delta.

Mount Pinatubo: The Aftermath of a Volcanic Eruption

This video segment adapted from NOVA features footage of the aftermath of the 1991 Mt. Pinatubo eruption in the Philippines, including falling ash and mud flows.

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Permian-Triassic Extinction

In this video segment from Evolution: "Extinction!", geologist Peter Ward discusses evidence for a Permian-Triassic mass extinction.

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Rock Cycle Animation

This visualization of the rock cycle from McDougal Littell/TERC illustrates common rock-forming processes such as crystallization, erosion, and metamorphism.

Sandy Coasts

This interactive resource adapted from the National Park Service profiles sandy coast environments and describes various features of sandy beach environments.

Types of Fossils

This interactive resource adapted from the University of California Museum of Paleontology features images of body fossils, trace fossils, and a combination of the two.