This is a great way for students to really understand how the different layers of the soil are different based on color and particle size.
Students are asked to describe each layer, choose which materials they will use to represent the layer and WHY.
Students sketch their cup at the bottom and then they have to verbally explain what they did before they can eat it.
I usually have students work in pairs and they may not be able to present until the second day depending on the length of the class, etc.
If you are unable to use school funds to get the needed supplies, perhaps, you could ask for parent donations or have them create it at home and bring it in to explain.
Basic supplies: small clear solo cups (like you would serve punch in), chocolate chips, white chocolate chips, graham crackers, vanilla wafers, vanilla sandwich cookies, chocolate sandwich cookies, grape nuts cereal, coconut (with green food coloring) and gummy worms to top off the horizons. You will also want small ziplock baggies so students can crush up cookies, crackers, etc. to get the desired texture. Paper towels are definitely a must as well. If you need to have students present the 2nd day, you'll want saran wrap to keep the layers from getting stale.