Prehistoric Earth VHS/DVD, Ever wonder how geologists know what happened on Earth billions of years ago?, Each

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Video covers the nature and divisions of geologic time, a variety of prehistoric life-forms, and how fossils reveal clues to Earth's distant past. Grades 3-6. Running time: 25 minutes.Geologic TimeExplains the system used by scientists to describe and organize prehistoric time periodsPrehistoric LifeDiscusses what modern scientists study to uncover facts about the pastEvents in Earth's PastChronicles events in the four major time periods (eras) within the geologic time scale: Precambrian, Paleozoic, Mesozoic, and CenozoicDinosaurs and FossilsPoints out that each time period is marked by a significant change in the number or type of fossils that are foundExplores what fossils reveal about Earth's history