Pbs Learning Media: Building a Biodiversity Timeline

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.

The enormity of the solar system can sometimes be too big to imagine. A scale model can help us visualize the size in an easy to understand way. Watch as scientists build a model of the solar system in a dessert just 7 miles in diameter!...

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...

Survey potential bridge sites, research bridge design, and select the right bridge for the right location in this interactive activity from the NOVA: "Super Bridge" Web site.

Are three seemingly separate volcanoes in Iceland actually connected to each other? For the first time, scientists can study a volcano from the inside and find out that these volcanoes are actually connected. Find out how in this video...

This video segment adapted from NASA's Goddard Space Flight Center explains how and where hurricanes develop. Learn how El Nino events alter the course of atmospheric circulation. Includes background reading material and discussion...

Learn about thermal energy, also known as heat or heat energy, and the ways in which it can move from one object to another,

Students learn about the giant impact hypothesis for the Moon's formation, and how the Apollo Moon rocks have contributed to scientists' understanding of the Moon.

Set variables for a simulated collision and observe the changes in reaction between two carts. Options include changing the weight of one cart and the type of collision to occur.

This animated essay from "American Experience" explains the difference between alternating and direct electric current and offers in-depth explanations about the role played by a battery, light bulb, wire, and generator. [2:27]