The 7th Age is learning about mixtures in science. A mixture is two or more different things put together. To portray this, I showed the class a beaker containing a tennis ball and some marbles. What two solids are present in this mixture? Why of course- the tennis ball and marbles! I then poured water into the beaker. What happened? The girls observed that the tennis ball floated and the marbles sunk. This is because when you mix solids with water, some objects will float, and others will sink.
After a group discussion, each scientist worked in pairs of two or three to investigate what sinks and what floats in water. Some items we used for this experiment were:
a coin
a straw
a colored disc
a piece of styrofoam
a sponge
a bean
a paperclip
a blown up balloon
Here are additional photos of the girls hard at work! We had fun performing this experiment!
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