Pizza crust: Outer Core (molten).
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| http://www.sodahead.com/living/which-type-of-pizza-crust-do-you-prefer/question-854075/?page=2&link=ibaf&q=&esrc=s | 
Sauce: Lower Mantle.
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| http://www.finecooking.com/recipes/no-cook-tomato-sauce-for-pizza.aspx | 
Cheese: shallow mantle.
|  | 
| http://fitness2at.com/2013/01/25/so-whats-the-plan/cheese-pizza/ | 
Toppings: crust and lithosphere.
|  | 
| http://www.cs.umb.edu/~rkotla/ | 
