Biomes

This interactive resource adapted from NASA describes the different temperature, precipitation, and vegetation patterns in seven biomes: coniferous forest, temperate deciduous forest, desert, grassland, rainforest, shrubland, and tundra.

Birds Surround Washington Monument

This Building Block video shows birds flying by the Washington Monument under gray skies, as shot through tree branches hung with lights.

Blood Flow and Thermoregulation

In this interactive activity adapted from the University of Alberta, learn about the ways your body can regulate its temperature.

Blood Vessels Help Tumors Grow

In this video segment, adapted from NOVA, Dr. Judah Folkman uses the scientific method to discover how cancer cells induce the formation of new blood vessels, which in turn nourish those cancer cells.

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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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Brooklyn Bridge

This Building Block video features an aerial shot from a helicopter circling over the Brooklyn Bridge and following the span across part of the river. Manhattan Bridge is visible in the background in New York City.

Butterflies

This video from Vegas PBS features colorful insects known as butterflies, and looks at the coloration, species, life cycle, and migration habits within their habitat.

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U.S. Capitol Dome at Night

This Building Block video begins on a long shot of the United States Capitol at night as seen from Pennsylvania Avenue. The camera then zooms in to a medium long shot of the brightly lit dome.

Capitol Fountain

In this Building Block video, an American flag flaps in a strong breeze next to the Capitol Dome. As framed by two plumes of water from the Senate Garage Fountain, this clip first focuses on the fountains, then switches focus to the building and the flag.

Carbon Cycle Diagram

This diagram from NASA Earth Science Enterprise illustrates Earth's carbon cycle.

Carbon Cycle Diagram

This diagram from NASA's Earth Science Enterprise illustrates the Earth's carbon cycle .

Carbon Cycle Diagram

This diagram from NASA's Earth Science Enterprise illustrates Earth's carbon cycle.

Carnivorous Plants of Texas

In this video adapted from Texas Parks and Wildlife Department, learn about carnivorous plants that act as both producers and consumers in an ecosystem. See sundews and blatterworts capture and digest insects.

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Carnivorous Plants of Cartwheel Bay

In this video segment from NatureScene, explore Cartwheel Bay, a wetland in South Carolina, and learn about the variety of carnivorous plants native to this unique landform.

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Cell Division

In this interactive activity adapted from the Exploratorium, explore the step-by-step process by which an animal cell divides to make more cells.

Cell Explorer

Explore the parts of a virtual animal cell in this interactive activity adapted from the Exploratorium. Learn about various cell structures and the roles they play in cell division, cellular respiration, and protein synthesis.

Cell Membrane: Just Passing Through

This interactive feature describes some of the most important structures and functions of the cell membrane.

Cell Transcription and Translation

In this interactive activity adapted from the University of Nebraska, learn how and where transcription and translation occur within a cell and observe both processes in detail.

Cellular Service

The goal of this interactive game is to keep a group of target cells healthy by using blood to deliver and take away various substances to and from the cells.

The Chandra X-Ray Observatory

Learn about the Chandra X-Ray Observatory's telescope system, science instruments, and spacecraft system in this interactive activity adapted from NASA.

Changing Views of Pluto

See images from the Hubble Space Telescope that show evidence of seasons on Pluto, in this video adapted from NASA.

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Characteristics of the Sun

This video segment adapted from NASA describes the basic characteristics of our star, the Sun.

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Cheetah

In this Building Block video, watch as a cheetah walks through green grass toward the camera, sits down, and looks around.

Chemical Bonds

This interactive activity developed for Teachers' Domain demonstrates how attractive forces between atoms create chemical bonds, resulting in the formation of molecules and compounds.

Close-up of Smoke Stack

In this Building Block video, the camera looks close-up at the top of a smokestack that is releasing exhaust into the clear blue sky.

Clouds

In this Building Block video, observe cumulonimbus clouds as seen from an airplane window.

Cloud Types

This interactive resource, adapted from NASA's S'COOL Project Tutorial, explains how you can classify and identify various types of clouds.

Coal Factory

In this Building Block video, the camera follows a conveyor belt that carries a black line of coal across barren earth to a factory, which is furnished with cooling towers exhaling steam.

Coastal Geological Processes

This interactive resource adapted from the National Park Service describes the many forces that affect shorelines, including tides, weathering, erosion, and deposition.

Collisions on an Air Track

In this interactive activity adapted from the University of Toronto, observe the effect of mass on momentum in elastic and inelastic collisions.

Colorful Creatures

For animals, bright, flashy coloration can serve as a warning or as an invitation. Either way, colorful skin, feathers, and scales yell, "Notice me!" This collection of images shows examples of some of the world's most colorful creatures.

Compost Office

This interactive activity from Keep America Beautiful, Inc. uses illustrated text and a game to explain why it is important to compost, the science involved, and the perfect recipe for decomposition.

Continental Divide: The Breakup of Pangaea

Examine geological evidence found in fossils, rock deposits, and ancient mountains that supports the theory of continental drift in this interactive activity adapted from the Exploratorium.

Cooking with Sugar

Find out about the chemistry of candy and how sugar reacts at different temperatures to become fudge, caramel, lollipops, and more in this interactive activity adapted from the Exploratorium.

Counting Neutrons on the Moon

Find out how scientists are using a neutron detector onboard a satellite to try to find water on the Moon in this video adapted from NASA.

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Cow's Eye Dissection

In this interactive activity adapted from the Exploratorium, watch videos of a cow eye dissection and see how an eye works.

Coyote

This Building Block video shows a close-up shot of a coyote on the hunt as it sniffs the air.

Dam

See an aerial wide shot of Glen Canyon Dam and Lake Powell in Page, Arizona, in this Building Block video.

Dance of Development

Watch the "dance" of development as a zebrafish egg divides and differentiates on its way to becoming an embryo in this interactive activity adapted from the Exploratorium.

Deforestation in Bolivia

This visualization adapted from NASA features two satellite images from 1984 and 2000 that show the dramatic deforestation of the Bolivian rainforest.

Desert Tortoise

This video segment from Outdoor Nevada examines threats to the desert tortoise population.

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The Disappearing Aral Sea

This visualization adapted from NASA features satellite images showing how more than 60 percent of the Aral Sea has disappeared during the last 30 years.

Disappearing Milk

A magician pours milk into a glass, but when he turns the glass upside down, nothing comes out. How does he do it? Discover the science behind the "magic" in this video adapted from the American Society of Mechanical Engineers.

Discovering Antarctica

Take a guided tour of Antarctica by watching brief video segments of its landscape and wildlife in this interactive activity adapted from the British Antarctic Survey.

Diversity of Hardwoods at Congaree Swamp

In this video segment from NatureScene, observe some methods of plant identification with regards to the diversity of hardwoods at the Congaree Swamp.

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DNA Animation

This Building Block video features an animation of a rotating DNA spiral.

DNA Lab

This Building Block video shows a close-up of a lab technician withdrawing a DNA sample from vial, then injecting it into a gel medium.

Documenting Glacial Change

This collection of comparative glacier images adapted from the National Snow and Ice Data Center shows substantial changes in five Alaskan glacier positions over periods of 60 to 100 years.

Domes at Piazza del Popolo

This Building Block video from the Building Big series features the twin domes of the churches at the Piazza del Popolo in Rome. In front of the churches is a lion fountain keeping guard, spewing water from its jaws.

Drilling to Antarctica’s Rock Core

In this video adapted from ANDRILL, find out how geoscientists get through more than a dozen football fields of ice and water in order to study the rock and sediment beneath Antarctica.

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