Pbs Learning Media: Sources of Radiation

This interactive activity from the NOVA: "Dirty Bomb" Web site explores sources of radiation, both harmful and beneficial, natural and manmade.

Scientists study ice sheets because they influence weather and climate, playing a role in atmospheric and ocean circulation. Ice sheets can also have huge impacts on global sea levels because they store so much water. Explore this...

This video clip shows a number of different light options and asks students to answer the question, where does light come from? [0:38]

Discover why the gray wolves were important to Yellowstone National Park before they become extinct in that area. Find out how gray wolves were reintroduced back into this area. [5:19]

Learn about the formation of elements from this video by NOVA and how these elements were incorporated into Earth when it formed. Closed caption available. [2:27]

Learn about the three phases of matter, and how the addition and removal of thermal energy (also known as heat) affects them.

Students learn how various kinds of data and information can be gathered to create a biodiversity timeline that serves as evidence of changes in a population of a species.

When light strikes an object it can cause reflection or absorption depending on the wavelength of the light and the property of the material that makes up the object. Watch this whiteboard animation for a full explanation and to find out...

In this lesson, students watch a video and animations that relate Isaac Newton's three laws of motion to baseball and apply what they've learned about these laws to another sport or other real-life situation.

Three choices of virtual worlds to enter: a vulture, a wolf or a shark world. Once inside these worlds view videos, play games, and discover the ecosystems of these wild animals.