Created especially for teenage learners of English, the Impact Video program is fully integrated into each unit of the Student Book. Each unit features two video clips, including:Main Video: the Main Video in each unit introduces a key concept of the unit theme in a unique way, either through live action National Geographic content or through an original animation designed specifically for the Impact program.Meet the Explorer: When students reach the Mission page of each unit, they’ll learn more about the National Geographic Explorer featured in the unit. These short, one-minute clips reinforce unit objectives, develop critical thinking skills, and allow students to hear from each eplorer in his or her own words.The video program is available on a DVD bound with the Lesson Planner, on the Classroom Presentation Tool, and on the Online Workbook.