Book excerpt: From the opening and closing of oceans over millions of years to the overnight reshaping of landscapes by volcanoes, the Earth beneath our feet is constantly changing. The Rough Guide to the Earth explores all aspects of our dynamic planet, from the planet’s origins and evolution and the seasons and tides to melting ice caps, glaciers and climate change. Featuring many spectacular images and helpful diagrams, this Rough Guide provides a fascinating and accessible introduction to Earth science.