You are lost at sea and all you have is the sun, a clock, and a sextant. Use those tools to figure out the longitude to tell you where you are.

Learn how Global Positioning Systems work with this activity, which simulates how a satellite finds your location on earth.

Use the map to discover the flora and fauna of the night forest. Solve the riddle to cross the stream, then build your own forest scene.

See how much you know about New York "low life" by taking this quiz about New York's subterranean features.

Watch how a simulated tsunami spreads across the Pacific from its South American origin.

Cross-section illustrations of a stratovolcano track the various stages of a volcanic eruption.

Reveal the secrets of marine life as you explore the pages of a field guide. Enter your observations in the notebook.

Feel what it's like to jump from a height of 100,000 feet. Deploy your two parachutes correctly for a safe landing.