Note: This is another extension of our geology unit. This lab comes shortly after the igneous rock lab and simulates how sedimentary rocks form. It is just a demonstration of the processes involved in the formation of sedimentary rocks, though it can be modified (different amounts of glue, dry vs. moist environments) to be a full fledged science experiment
Grade levels: 2-6
Demonstration:
Supplies: Styrofoam or paper cups, sand, popsicle sticks or disposable spoons
Step 1: Fill an 8 oz. cup about 1/3 full with sand
Step 2: Slowly add glue until the sand/glue mixture has a peanut butterish texture - not runny or too liquidy
Step 3: Use a wooden block or the bottom of another cup/glass to compact the sand glue mix as much as possible.
Step 4: Leave the cup in a dry area for approximately two weeks
Things to look out for:
1. Too much glue is the most common problem. It will take a much longer time to turn into a rock if too much glue is used.
2. Add more sand if things get too runny.
3. It usually takes about two weeks to harden, but sometimes longer
4. After the mixture hardens into a sandstone, you'll need to tear away the cup. Paper cups are the easiest to tear away.
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