Name two basic mold types that distinguish casting processes.

The two basic molds are: Expendable mold and permanent mold. 

Molding is a process where a rigid frame (mold) is being used to manufacture by shaping liquid or pliable raw materials. However, molding is synonymous to casting; casting is a process where a liquid metal is delivered into a mold which contains a hollow cavity of the intended shape. 

Expendable mold casting can be classify as sand, plastics, plaster which make use of non-reusable or temporary molds  while Permanent mold casting is a metal casting process that use reusable molds.

d. planting trees

the trees take in carbon to make oxygen.

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