Audience: Students; Grades: 4-8; Subject: Science. (2005) Introduces the Earth's geological timeline and identifies the life forms that existed during these prehistoric periods. Explains the concept of plate tectonics, illustrating how shifting plates led to the Earth's changing surface through the formation of landforms. Highlights the significant changes that occurred during these geologic periods, exploring the evolution of cells and the life forms that existed during each era and introducing the concept of extinction biology. Concludes with a ten-question video quiz. For the teacher's guide go to: https://drive.google.com/folderview?id=0B9ZT7PYcIjLffkxaOVRIMXNOTGQ3SjV4VlFCQnRKZktGZUIwcTRtakdsN0pyQkFwaUotUVE&usp=sharing