Students examine the world's rivers in this six lessons unit which mingles science with social studies. The dynamic forces that create erosion in nature are also seen as habitats and ecosystems that are affected by environmental and man...

Students analyze the difference between the human habitat and the different habitats of animals in the six lessons of this unit. The students' imaginations and literature are used to explore important aspects of the living environments...

[Free Registration/Login may be required to access all resource tools.] Aquatic biomes can be generally classified based on the amount of salt in the water. Freshwater biomes have less than 1% salt and are typical of ponds and lakes,...