The Academic Encounters Second edition series uses a sustained content approach to teach skills necessary for taking academic courses in English. There are two books for each content area. Academic Encounters Level 1 Class Audio CDs (3) Listening and Speaking: The Natural World contains the listening materials for Academic Encounters Level 1 Student's Book Listening and Speaking: The Natural World. The materials include warm-up listening activities, informal interviews, and formal academic lectures. Videos of the lectures are also available on DVD, which comes with the Student's Book.