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Edible Four-Layer Earth
You will need a large mixing bowl (the larger the better) for this activity. To end up with a frozen model of half the earth, you will need these materials:
green ice cream
graham crackers
chocolate ice cream
with nuts
yellow ice cream
Dragees (little metal-like edible silver spheres)
vanilla ice cream
red food coloring
green food coloring
Procedure
Before constructing the edible earth, you may wish to make a scale model cross-section, or relate the size of the sections to known objects, such as the mantle to the size of a grapefruit and the outer core to the size of an egg.
Make each layer and then freeze in the mixing bowl (one layer at a time).
The four layers to make in order are:
1. Crust: use green ice cream and crushed graham crackers.
Freeze this layer.2. Mantle: chocolate ice cream with nuts (rocks).
Freeze this layer on top of. crust.3. Outer core: yellow ice cream with a few Dragees sprinkled throughout.
Freeze this layer on top of the mantle.4. Inner core: gray ice cream (made by adding equal amounts (drop by drop) of red and green food coloring to vanilla ice cream), and a greater concentration of Dragees.
Freeze this layer on top of the outer core.When your model is finished you can observe the layers, compare them, and then best of all, eat them!