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Since, many people may not be familiar with the awesomeness of geologic sandbox models, and their use in the classroom, I collected some youtube links to show how amazing these models can be.
Extensional normal faulting:
Fold-thrust belt development:
A simple example of how to demonstrate normal faulting with accessible and inexpensive materials (once you have a sandbox) is given by this video from the West Virginia University Dept. of Geology.
Here is their description of materials they used for representing structural layers with different strength properties:
"The sediments are a mix of sands, flour, cornmeal, and cocoa powder. The basal layer is a loose sand to resemble a detachment surface. The base of the box has a doubled-up elastic (Ace) bandage which distributes the extension semi-evenly."
The typical classroom scenario with these models is to use a simple extensional model (like the WVU one above) to demonstrate formation of the Basin and Range province of the western US.
Students quickly get a sense of how extensional stress (pulling apart) in Earth's crust can break (fault) the brittle upper layers, while ductile lower layers (coarse sand, ace bangage) just stretch. They also get a sense of how rotational fault blocking (domino faulting) can generate characteristic parallel mountain ranges within the landscape.
A good activity is to have the students tape acetate sheets on the outside of the acrylic and trace the layering and faulting at different points in the extensional process. This works just as well within PPT too, just have the students take pictures at various time points and trace the features digitally.
Having the ability to print out as many sandboxes as desired means you don't have to rely on an single sandbox for all students to crowd around in class! Plus, students quickly compare results from different models with different setups.