The video is being made. Until it arrives, here is what it will say (111 words, about 56 seconds):

Here's Miss Garcia's class on the steps of the old courthouse.

The steps are white stone with gray wavy stripes, the roof is dark gray stone, and the walls are speckled granite.

Miss Garcia says two of these rocks were once a completely different rock. Jada looks at the hard white step and cannot believe it.

Which two rocks changed, and what could change a rock?

And under the town, one rock holds water like a sponge.

To find out, we will look at wavy stripes in rocks, heat and squeezing, sorting rocks into families, and which rocks hold water and oil.

Okay, so are you ready to sort the rocks?

It ends with a ready line. Then pick a reply below — any reply counts.