We are pleased to announce that Dr. Lisa Hammersley has taken on a much larger role as an author of physical Geology, as Charles plummer assumes a less active role. To mark this change, the fifteenth edition has been redesigned to give it a fresher look that is more inviting to students. Bolder colors, clearer layout, and single-page chapter openers are all part of this redesign. Each chapter now opens with an introductory para-graph that first engages the reader with the topic through questions or observations and then outlines the approach that will be taken as students work through the chapter. This introductory material is no longer divided between the chapter opener page and the main text, which will provide more encouragement for students to read it.

1. Introducing Geology, the Essentials of Plate Tectonics, and Other Important Concepts.
2. Atoms, Elements, and Minerals.
3. Igneous Rocks, the Origin and Evolution of Magma, and Intrusive Activity.
4. Volcanism and Extrusive Rocks.
5. Weathering and Soil.
6. Sediment and Sedimentary Rocks.
7. Metamorphism and Metamorphic Rocks.
8. Time and Geology.
9. Mass Wasting.
10. Streams and Floods.
11. Groundwater.
12. Glaciers and Glaciation.
13. Deserts and Wind Action.
14. Waves, Beaches, and Coasts.
15. Geologic Structures.
16. Earthquakes.
17. Earth's Interior and Geophysical Properties.
18. The Sea Floor.
19. Plate Tectonics-The Unifying Theory.
20. Mountain Belts and the Continental Crust.
21. Global Climate Change.
22. Resources.
23. The Earth's Companions.

AUTHORS
Charles C. Plummer
(Emeritus of California State University at Sacramento)

Diane H. Carlson
(Emeritus of California State University at Sacramento)

Lisa Hanmmersley
(California State University at Sacramento)

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