This 44 piece clip art set features a diagram of 4 of Earth's spheres (lithosphere, hydrosphere, atmosphere, biosphere) and individual illustrations of each sphere. Also included is a diagram depicting 5 levels of organization (species, population, community, ecosystem, and biosphere) and individual illustrations of each level. There are labeled and unlabeled versions of each illustration. The set includes 22 PNG color illustrations, and 22 grayscale / blackline versions. These are high resolut