1. Down to Earth

2. The Restless Planet

3. Earth's Interior

4. The Sea Floor

5. The Birth of a Theory

6. Plate Dynamics

7. Mountain Building

8. Earth's Structures

9. Earthquakes

10. Geologic Time

11. Evolution Through Time

12. Minerals: The Materials of Earth

13. Volcanism

14. Intrusive Igneous Rocks

15. Weathering and Soils

16. Mass Wasting

17. Sedimentary Rocks: The Key to Past Environments

18. Metamorphic Rocks

19. Running Water I: Rivers, Erosion and Deposition

20. Running Water II: Landscape Evolution

21. Groundwater

22. Wind, Dust and Deserts

23. Glaciers

24. Waves, Beaches and Coasts

25. Living With Earth, Part I

26. Living With Earth, Part II

Episode 23. Glaciers

What do glaciers leave behind when they retreat?

Describe how snow is converted to glacial ice.

What part of a glacier moves quickest? What part moves slowest?

What is basal slip?

Why do continental ice sheets flow away from their center?

What is the snowline, and what does it separate?

What are striations?

What is till?

What are moraines?

Summarize the theories concerning the origin of ice ages.

Why do rivers often run faster during an ice age?

How do atmospheric CO2 levels relate to ice ages?

How long ago did the last ice age end?

How much have atmospheric CO2 levels increased since 1850? Why has this happened?

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