Third graders in Mrs. Bennett’s room studied different systems of the human body. Students identified the different parts of the digestive system and how it works by using nylon hose and filling them with oatmeal, then watching as it moved through the hose. This gave students an idea of what happens as food is passed through the intestine. Then students discussed and identified parts of the circulatory system. They made a model of their blood using empty water bottles. They started with yellow plasma by adding food coloring to their water. Then using Cheerios soaked in red food coloring, students were able to see how red blood cells affect the plasma. They then added marshmallows and discussed the job of white blood cells, along with purple pom poms to represent platelets.
In Mr. Dow’s room, students experimented with the states of matter and air pressure. During these labs, students were able to see how dry ice changes directly from a solid to a gas. They also saw how gas can create air pressure and will inflate a balloon. They saw this by putting a piece of dry ice in a balloon and tying it. As the dry ice melted and became gas, it inflated the balloon. Students also built and launched rockets, using water bottles, to show how areas with high pressure will try to escape to areas of low pressure. After building the rockets, the students used an air pump to create an area of high pressure in the bottle. When the pressure in the bottle got too high, it sent the rocket flying.
In Mrs. McCuin’s room, students studied density and how things dissolve. The students dissolved skittles in regular water and sugar water. They made a hypothesis as to which would dissolve sooner and why. For the last experiment, the students put a peep in a bowl of water. Only the sugar that touched the water dissolved, leaving a peep that was 2 different colors.
In Mrs. McKenna’s room, students experimented with what happened when you crush pop rocks. They contain carbon dioxide that is released, making a popping sound when you crush them. This led them to the next lab studying real rocks. They were hard to crush! They tested the hardness of rocks with a scratch test and observed with a magnifying glass the properties of many different types of rocks. The last lab the students made their own crystal rocks on pipe cleaner flowers. These were made from a solution of borax and boiling water.
During all of these experiments each student had a science log they filled out. They learned about the scientific method and were able to record their hypothesis and findings from each experiment.