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.

Throughout the day, your nervous system monitors and makes endless adjustments to your body's basic systems--all to keep you alive. This interactive feature illustrates the complexity of such a task.

In this interactive activity from Shedd Aquarium, students will build a fish and then release it into the reef to search for food and evade predators. Students will try different combinations and observe how each kind of fish has unique adaptations that help it survive in its habitat.

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

This interactive roller coaster ride produced for Teacher's Domain illustrates the relationship between potential and kinetic energy. As the coaster cars go up and down the hills and around the loop of the track, a pie chart shows students how energy is transformed back and forth between gravitational potential energy and kinetic energy.

In this interactive activity adapted from the University of Utah's ASPIRE Lab, students will investigate frequency in terms of trampoline jumps, pendulum swings, and electromagnetic waves.

Sharpen your skills with these Search Challenges. Test your strategies and tactics as you attempt to solve puzzling Internet research problems efficiently and effectively. Choose from multi-leveled games that feature various themes including soccer. Need more challenges? Search Challenge Archive.

In this lesson students will learn how to use keywords to refine a search

Why do hot air balloons float? This resource from the NOVA Web site offers a series of interactive activities that illustrates the physics of hot air balloons.

Discover the difference between free-falling and weightlessness in this interactive activity from the NOVA: "Stationed in the Stars" Web site.

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

Learn what it takes to build an igloo from the best kind of snow to the most effective tools and other little-known facts about these traditional Canadian Inuit structures in this interactive activity from NOVA.

This link has many tools to help understand the revolutionary sciences and discoveries in genetics.

Nitrogen, one of the most abundant elements in the universe, is essential to life. This interactive activity adapted from the University of Alberta provides an overview of the nitrogen cycle. Includes background reading handout and discussion questions.

Grade 8, Grade 9, Grade 10, Grade 11, Grade 12
You're the geneticist now. In this interactive feature developed for the companion Web site for NOVA/FRONTLINE: "Harvest of Fear," use the latest in genetic technology to engineer your own "supercrop" of tomatoes.

In this interactive activity from ChemThink, students will examine the basic properties of matter at an atomic level and consider how various atoms affect the way a substance behaves.

This interactive periodic table developed for Teachers' Domain provides detailed information about the chemical properties of elements and illustrates the electron configurations that determine those characteristics.

This interactive feature from the NOVA: "Leopards" Web site presents a wide variety of ways in which animals use coloration to their advantage.

Self-scoring interactive lesson for improving skills in scanning informational texts and charts for keywords and specific details.