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?