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This was one of those Ahhhh moments. I was teaching a group of students where water goes when poured into sand. The conversation went a little like this. *one cup of water is poured over two cups of sand*
kids: The sand is bubbling. Is it boiling?
Me: No, it's not hot.
Me: Where did the water go? The level is going down.
Kids: Maybe it's dissolving.
Me: Does water dissolve?
Kids: No.
Me: Then what is dissolving? The Sand? What is sand made out of?
Kids: Shells
Me: Well yeah, here in Florida it is but what is this sand made out of?
Kids: Rock.
Me: Right, and does rock typically dissolve?
Kids: No!
Me: So where did the water go? *water level is now just above the level of the sand*
Kids: *light bulb goes on* Down into the spaces between the sand pieces.
Me: DingDing! Yes! *sigh of relief*
I love when this happens and they figure it out for themselves. We never got back to the whole bubbling part but we'll leave that for next time.

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