PBS
Pbs Learning Media: Allopatric Speciation
These images from the Smithsonian Institution depict Nancy Knowlton's work with snapping shrimp in Panama. Knowlton found that the closing of the isthmus -- dividing the Pacific Ocean from the Caribbean -- resulted in new species of shrimp.
PBS
Pbs Learning Media: Sex and the Single Guppy
Play in our streams and see how exhibitionism has an evolutionary payoff in this simulation of John Endler's famous experiment. Includes background information and discussion questions.
PBS
Pbs Learning Media: Social and Historical Perspectives of Dogs
Learn more about the theory that dogs evolved from wolves in this video from Nature. [5:03]
PBS
Pbs Learning Media: Greenland Ice Sheet Project 2: A Record of Climate Change
Using images and graphs, this interactive resource illustrates scientists' efforts to study Earth's climatic history for the last 250,000 years by drilling into the Greenland Ice Sheet and examining ice cores. Includes background reading...
PBS
Pbs Learning Media: A Cow's Digestive System
Learn how a cow eats and digests food in this video segment from Nature.
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Pbs Learning Media: Brown Reactions: Black Educators
This 1954 statement, issued by a group of black educators, strongly endorses the Supreme Court's Brown ruling.
PBS
Pbs Learning Media: Brown Reactions: Editorials
This sampling of newspaper editorials from the mid-1950s reflects the range of public opinion and responses to the Brown decision.
PBS
Pbs Learning Media: Diamonds: The Science Behind the Sparkle
This illustrated essay from the NOVA Web site explains why the atomic structure of a diamond slows down light and produces a sparkle more brilliant than from any other colorless substance.
PBS
Pbs Learning Media: Tetrapod Limbs
This illustration from Evolution by Monroe W. Strickberger shows the remarkable similarities between the bones in the forelimbs of various tetrapods, all of whose limbs serve very different functions.
PBS
Pbs Learning Media: Shape of Trees: The Frustration Principle
This series of images shows the work of biologist Karl Niklas on the adaptations and evolution of plants. From The Evolutionary Biology of Plants.
PBS
Pbs Learning Media: Whales in the Making
This graphic from Evolution, traces the evolution of whales from land-dwelling mammals to the aquatic creatures we know today. A PDF is included that diagrams the evolutionary process that is believed to have taken place.
PBS
Pbs Learning Media: How Genetic Disorders Are Inherited
Learn how genetic disorders are passed from parents to children as explained in this excerpt from Blazing a Genetic Trail, from the Howard Hughes Medical Institute.
PBS
Pbs Learning Media: Cave Formation: Biogeochemical Cycles
This video segment adapted from NOVA chronicles the discoveries that led to a radical new theory in which living organisms, not just geological processes, play an active role in cave formation. [5:42]
PBS
Pbs Learning Media: 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.
PBS
Pbs Learning Media: Sandy Coasts
In this interactive resource adapted from the National Park Service, learn about beaches, spits, and other sandy landforms that characterize some of America's coastal national parks.
PBS
Pbs Learning Media: Rocky Coasts
This interactive resource adapted from the National Park Service profiles rocky coast environments and describes how various geologic features form.
PBS
Pbs Learning Media: Forecasting Volcanic Eruptions
This media-rich essay from NOVA Online describes the challenges of forecasting volcanic eruptions and includes information about specific cases.
PBS
Pbs Learning Media: Natural Wonders
Many of the interesting landmarks around the world are formed over time by natural processes familiar to us in our everyday lives. This still collage produced for Teachers' Domain features images of a variety of beautiful natural wonders.
PBS
Pbs Learning Media: Mountain Maker, Earth Shaker
This interactive activity adapted from A Science Odyssey Web site helps you visualize different types of plate tectonic activity and shows the impact this activity has on Earth's surface.
PBS
Pbs Learning Media: Volcanic Eruptions and Hazards
This interactive resource adapted from the National Park Service illustrates the difference between explosive and effusive volcanic eruptions, as well as the hazards that can result, including lahars, tsunamis, and lava flows.
PBS
Pbs Learning Media: Volcanic Features
This interactive resource adapted from the National Park Service illustrates the variety of landforms and features created by volcanoes. Featured are calderas, craters, fumaroles and other geothermal features, igneous rocks, lava flows,...
PBS
Pbs Learning Media: The Wall of Time
This illustrated timeline from the Lunar and Planetary Institute provides a journey through four-and-a-half billion years of time from the birth of our solar system to its current existence today.
PBS
Pbs Learning Media: Mammals Get Their Chance
In this video segment adapted from NOVA, animations of an asteroid hitting Earth are used to illustrate this widely accepted theory of dinosaur extinction and the resulting conditions that favored mammals.
PBS
Pbs Learning Media: Above the Clouds: Telescopes on Mauna Kea
This video segment adapted from First Light explains why the highest peak in the Pacific, Mauna Kea, is an ideal site for astronomical observations. Featured are new telescope technologies that allow astronomers to explore the universe...