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 14. Intrusive Igneous Rocks

What factors contribute to the formation of magmas?

Discuss in detail the differences between mafic, intermediate, and felsic magmas.

How does cooling history relate to the texture of the resulting rock?

How do textural variations within the dike illustrate the effect of cooling history?

Discuss cooling and the formation of phaneritic, aphanitic, and glassy textures.

What is Bowen's Reaction Series and how does it describe magma crystallization?

How does differentiation relate to the evolution of magmas?

How does magma composition relate to plate boundaries?

Describe the formation of intermediate (andesitic) magmas in subduction zones.

Describe granitic (felsic) rocks.

What are xenoliths and what do they represent?

Describe the formation of a batholith.

How does the study of igneous rocks help in our interpretation of earth history?

Compare and contrast igneous rocks found on the continents and ocean floor.

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