Materials Similar to The Round Earth and Christopher Columbus
- 48%: The Exploration of the Earth's Magnetosphere
- 44%: The Great Magnet, the Earth: The Self-Sustaining Dynamo in the Earth's Core
- 39%: Nova: Origins
- 38%: Hurricanes: The Greatest Storms on Earth
- 38%: Nebraska Astronomy Applet Project: Basic Coordinates and Seasons Lab
- 36%: The Great Magnet, the Earth
- 35%: Live from Earth and Mars
- 33%: Significant Figures and Rounding Rules
- 33%: Explorers 1 and 3 - The Discovery and Early History of the Earth's Radiation Belts
- 33%: The Exploration of the Earth's Magnetosphere: Electric Currents from Space-- History
- 31%: Astronomy of the Earth's Motion in Space
- 31%: eCUIP Project: Cultural Astronomy -- Bringing the Heavens to Earth
- 30%: Folding Paper Model of the Magnetosphere
