Image credits
Image Credits:

Photos: Grand Canyon: NPS; Seattle earthquake: USGS; Wrangel mountain: USGS; Anatahan volcano: NOAA; Protoceratops fossil: courtesy of AMNH; marine fossil: NPS; gabbro: courtesy of AMNH; igneous, sedimentary, and metamorphic rocks: courtesy of AMNH; Mars: NASA/JPL; scientist at volcano: USGS; Illustrations: courtesy of AMNH