As a land that is constantly in flux, Earth sometimes reveals clues about the plants, animals, and other organisms that lived long ago. Fossils teach us much about what life was like millions of years ago, answering the questions of how Earth changed and maybe even why it changed. .

Includes fact boxes, charts, diagrams, a glossary, and index.

En busca de huellas de fosiles -- Que son los fosiles? -- Clases de fosiles -- Como se forman los fosiles? -- Material sedimentario! -- Zonas de fosiles -- Levantamiento y exposicion -- Descubrir el pasado de la Tierra -- Antiguedad de los fosiles -- Preservar el pasado de la Tierra.