Chapter 1
Earth, Photo Researchers, Inc.

Chapter 2
Quartz Crystals, Jeffrey A. Scovil
Galena, American Geological Institute
Conchoidal fracture, E.J. Tarbuck

Chapter 3
Obsidian, American Geological Institute
Porphyritic texture, E.J. Tarbuck
Scoria, American Geological Institute
Basalt Rock, E.J. Tarbuck
Phaneritic Texture, E.J. Tarbuck
Concept Quiz 3 Question 6, USGS

Chapter 4
Volcanic Bomb, American Geological Institute
Concept #3 Quiz question #9, USGS
Crater Lake, Tom Stack & Associates, Inc.
Concept Quiz #4 question #4, USGS

Chapter 5
Bryce Canyon, Corbis/Stock Market
Concept Quiz #5, Courtesy of the United States Department of Agriculture

Chapter 6
Canyonlands National Park, Carr Clifton Photography
Grand Canyon, Tom & Susan Bean, Inc.
Great Sand Dunes National Park, Muench Photography, Inc.

Chapter 7
Slate, E.J. Tarbuck
Metaeonglomerate, E.J. Tarbuck
Garnet Inclusions, E.J. Tarbuck

Chapter 8
Rock fall, AP Wide World Photos

Chapter 9
Riding the Rapids, Visuals Unlimited
Braided Stream, Bradford Washburn

Chapter 10
Soda Straw Stalactites, Tom & Susan Bean, Inc.

Chapter 11
Matterhorn, E.J. Tarbuck
Roche moutonne, Yosemite, E.J. Tarbuck
Matterhorn, E.J. Tarbuck
Glacial Landforms, Ward's Natural Science Establishment, Inc., JLM Visuals
U-shaped glacial valley, John Montagne

Chapter 12
A playa or dry lake bed, Photo Researchers, Inc.

Chapter 13
Erosion, Oregon coast, E.J. Tarbuck
Groins, Cape May, NJ, John S. Shelton

Chapter 14
Anchorage, Alaska, National Oceanic and Atmospheric Administration/Seattle

Chapter 17
Mount Sneffels, Art Wolfe, Inc.

Chapter 18
Upper portion of the Grand Canyon, E.J. Tarbuck

Chapter 19
Extinct coiled cephalopod, American Geological Institute