Materials:
a bag with some rocks and shells in it
a jar with some rock powder
a jar with some ground shell
Open the bag. Separate the rocks from the shells.
Was it easy to do this? Why?
How are rocks and shells different?
Get the two jars with powder in them. One has ground rock, the other ground shell. Which is which? How can you tell?
How can you know for sure?
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For the parent: My husband made the rock and shell powders using some kind of hammer-thing. Do not label the jars "rock" and "shell." If you want you can label them "1" and "2" or "A" and "B." This is another experiment meant to help kids see that we can identify things if we know something about them. In this case, they have experience with rocks and shells and can differentiate between them based on what they know rocks and shells look like. But, if rock and shell can no longer be identified visually, can we still differentiate between them?
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