Here is some student thinking!
It was just our luck too, that two students were going to Galesburg, IL during Thanksgiving, and we knew from a map of IL that Galesburg has both wells and aquifers. These students brought back some of the soil from there so we could be as realistic as possible to see what happened with the groundwater there.
We built a landscape adding all kinds of soil and rock, and underneath them we placed some dark colored paper to see if it got wet (we figured out that the paper turns a darker color when wet so that would give us evidence if the water went all the way through the material. We saw lots of cool stuff...and it made us think some more (of course)!
We also saw little pools start to develop, as well as little streams. We also noticed that the tilt/slant/angle of the surfaces makes the water flow. We began some models to get our thinking visible, and we'll establish consensus tomorrow!