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How do geologists know what happened on Earth billions of years ago? Segments cover the nature and divisions of geologic time, a variety of prehistoric life-forms, and how fossils reveal clues to Earth's distant past.
- GEOLOGIC TIME: Explains the system used by scientists to describe and organize prehistoric time periods.
- PREHISTORIC LIFE: Discusses what modern scientists study to uncover facts about the past.
- EVENTS IN EARTH'S PAST: Chronicles events in the four major periods within the geologic time scale: Precambrian and the Paleozoic, Mesozoic Era, and Cenozoic eras.
- DINOSAURS AND FOSSILS: Points out that each time period is marked by a significant change in the number or type of fossils found, and explores what fossils reveal about Earth's history.