Surfaces: The Atmosphere

ANIMATION: What does permeable mean? REHASHED FROM PREVIOUS FOUR EPISODES: Trini learns about protecting the human body from the cold while climbing a mountain. Marc witnesses amazing close-ups on an electron microscope. Lisa sees a glassblower. Marc informs Trini about melanin in a person's skin. In Hawaii, Lisa sees a volcano. FILM INSERT: How bubbles are used. Discussion on why bubbles are round. ANIMATIONS: The moving rocks of Earth. FRESH MATERIAL: Marc explains how an egg gets its shape.