(Describer) The title’s held up on signs in front of a tank.

(child narrating) Sometimes things float in water, like you on a raft in the swimming pool. Sometimes they sink like these rocks. Let's experiment to see what will sink and what will float in this fish tank. We'll chart our results to keep track of what we learn. Do you think this nickel will sink or float?

(Describer) It’s dropped in the water.

It sinks. Do you think these marbles will sink or float? They sink too. What about this balloon? It floats. Do you think this crayon will sink or float? It sinks. Do you think this pumpkin will sink or float?

(Describer) It’s a small one. It’s dropped in.

It floats. What about this sponge? It floats. How about this toy?

(Describer) A plastic wind-up bear. It’s dropped in.

[clanging]

It sinks. Let's look at our chart. Why do you think some items sink and some items float?

(Describer) Accessibility provided by the US Department of Education.