Build an Underwater Scope
Sometimes the best way to learn about what goes on in the water is to et right down in it. Since people can't breath below the surface, we need special equipment to discover the underwater world. SCUBA (self-contained unerwater breathing apparatus) divers use air tanks or submarines to study water creatures. A much easier way to get closer to the animals which make their homes in lakes, rivers, and streams is to make your own underwater scope.
Using the can opener, cut the end off the coffee can to make a tube.
With the scissors, cut a circle of plastic wrap to fit over one end of the can. Make sure it overlaps by at least two inches.
Stretch the plastic wrap tight like a drum and secure it with the rubber band. You may want to tape the edges of the plastic wrap down with duct tape or other strong tape.
With the open end facing up, place the covered end of the tube about one inch below the surfvace of the water. Look down into the water through the scope to discover a whole different world! Can you fid examples of free-swimming and bottom-living animals? Look for predators. How many food chains can be observed?