Students learn about the differences between types of water (surface and ground), as well as the differences between streams, rivers and lakes. Then, they learn about dissolved organic matter (DOM), and the role it plays in identifying drinking water sources. Finally, students are introduced to conventional drinking water treatment processes.

Biology 2e is designed to cover the scope and sequence requirements of a typical two-semester biology course for science majors. The text provides comprehensive coverage of foundational research and core biology concepts through an evolutionary lens. Biology includes rich features that engage students in scientific inquiry, highlight careers in the biological sciences, and offer everyday applications. The book also includes various types of practice and homework questions that help students understand—and apply—key concepts. The 2nd edition has been revised to incorporate clearer, more current, and more dynamic explanations, while maintaining the same organization as the first edition. Art and illustrations have been substantially improved, and the textbook features additional assessments and related resources.

By the end of this section, you will be able to do the following:

Describe the effects of abiotic factors on the composition of plant and animal communities in aquatic biomes
Compare and contrast the characteristics of the ocean zones
Summarize the characteristics of standing water and flowing water freshwater biomes

Students construct three-dimensional models of water catchment basins using everyday objects to form hills, mountains, valleys and water sources. They experiment to see where rain travels and collects, and survey water pathways to see how they can be altered by natural and human activities. Students discuss how engineers design structures that impact water collection, as well as systems that clean and distribute water.

Here, read Mark Twain's (1835-1910 CE) book, "Life on the Mississippi," which was originally published in 1883. Download two HTML versions of the text: one providing links to images in the original text and one with images included.

Between 70 and 75% of the Earth's surface is covered with water and there exists still more water in the atmosphere and underground in aquifers. In this lesson, students learn about water bodies on the planet Earth and their various uses and qualities. They will learn about several ways that engineers are working to maintain and conserve water sources. They will also think about their role in water conservation.

By testing your local water quality, you will be able to compare your results with students around the world. Register your class, and follow the project instructions. Additional teacher resources, references, and Ask-an-Expert sources are availible

Explore landforms and water bodies in this animated video [8:49] from PEEP and the Big Wide World. Three adventurous friends -- Peep, Chirp, and Quack -- have a firsthand encounter with a very big rock stuck on the steep slope of a hill. Students can use the video to observe, identify, and describe characteristics of a landform (hill) and two bodies of water (pond, stream). An Activity, Background Essay, and Teaching Tips are available for this video.

Students perform a macroinvertebrate survey to gauge the health of a local river. They collect water samples and count macroinvertebrates to learn how the health of a river's ecosystem can be determined by its river insect population.