This National Park Service website contains environmental education units for elementary and middle school students which consist of activities centered around an environmental theme. These themes include biodiversity, habitats, natural adaptation, patterns and order in nature, environmental cycles and change, interactions and interdependence within an ecosystem, and water in the environment. There is also information on: planning a visit to the park; the wildlife, geology, cave exploration and paleontology of the park; the park history; and the role of fire in the park. Educational levels: General public, Intermediate elementary, Middle school, Primary elementary