Eco-Spheres Ecology and Environment 15 Poster Set - Laminated. Geosphere, Anthrosphere, Biosphere, Atmosphere, Hydrosphere. This Poster Series includes 15 Laminated Posters. Each Poster Measures 18" x 32" Double Side Laminated and Sealed for Long Lasting Durability. Professionally Printed at Highest Resolution for Vivid, Dynamic Images. Excellent teaching tool for Science Classrooms - Geography, Ecology