University of Chicago
Center for Astrophysical Research in Antarctica: Don't Be Too Flaky
After reading some facts about the properties of water, students conduct experiments to measure the relative densities of water, ice and snow and submit the results to the website.
Science is Fun
Science Is Fun: Sinking and Floating Soda Cans
An experiment to determine if either a regular or a diet can of soda will float or sink when placed in water, and what causes this.
Museum of Science
Museum of Science and Industry: Online Science: Design a Submarine
Become an engineer, and design a submarine that moves in the water like a real submarine. Try making it sink, float, and hover in the water.
TeachEngineering
Teach Engineering: Clay Boats
Each student uses a small quantity of modeling clay to make a boat that will float in a tub of water. The object is to build a boat that will hold as much weight as possible without sinking. In the process of designing and testing their...
Science Education Resource Center at Carleton College
Serc: Investigating Chromatography: Selecting Variables
For this lab, students will demonstrate observation skills as they design an experiment to separate colors of various water-based pens in order to learn about mixtures and solutions. Students will determine a variable to test and...
My Science Site
Life Systems: Cells, Tissues, Organs
Extensive site for teachers provides some helpful resources that pertain to plant and animal cells. Includes a microscope diagram as well as plant, animal and pond labs. Also contains links to structures and mechanisms, matter and...
Other
Bigelow Laboratory for Ocean Sciences: Salinity and Deep Ocean Currents
For this activity, students will investigate how temperature and currents affect the salinity of ocean water, making predictions after studying ocean maps. It is recommended that teachers do the experiment themselves before presenting it...