Download Add to Favorites Add to Folder creative writing children's book activities classroom tools language arts and writing vocabulary Create new folderCREATE NEW FOLDER Share Students determine the hardness of two water samples, labeled only as A and B. Assesses their understanding of factors that affect water quality, including the hardness of water. Scoring rubric and background notes included. Grade: 6 | 7 | 8 | 9 | 10 Subjects: Science Electricity Electricity and Magnetism (Electromagnetism) Physics Ponds and Marshes Lakes Pollution Water Cycle, Ground Water, Rivers (Hydrology) Natural Resources Habitats and Ecosystems Ecology Biology Environmental Science Earth Science Geology + show tags TYPE: Activities Worksheets