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easy explanations... first make jello and have her stick her finger in it... explain as she meets the resistance about the resistance being dense. next, (and this is a really cool/fun one!) make crystals... take sugar or salt (I don't have the correct proportions, that could probably be googled). make the mixture, put it into a glass, take a pencil, tie a string, (and this has to be a good old fahioned cotton string as it needs to "wick") around it, and let it drape into the water. the water will evaporate and the sugar or salt will form crystals around the string. this should help explain it! (it is REALLY cool to put food coloring in the water!)
edit: the pencil lays atop the glass with the string dangling down
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