Lesson 10: To the edge of the atmosphere - and beyond!

Lesson 9: Exploring by balloon/The age of flight

Lesson 8: The mysterious valley/The atmosphere

Lesson 7: Into the heart of a glacier / Rivers—Earth’s lifeline

Lesson 6: A River in the Ocean/Three Spheres

Lesson 5: The compass/Time and longitude

Lesson 4: The 10,000 names of the wind/The mystery of Tides

Lesson 3: The Spanish sail west/Sailing around the world

Lesson 2: Marco Polo’s Big Adventure

Lesson 1: How big is the Earth?