The original rock that has undergone metamorphism is called the protolith. Protolith can be any type of rock and sometimes the changes in texture and mineralogy are so dramatic that is difficult to distinguish what the protolith was. 1  Note that diagenesis and weathering are also a changes in form that occur in rocks.
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The focus of study. can be at different system levels. One goal of industrial ecology is to change the linear. nature of our industrial system, where raw materials. are used and products, by-products, and wastes are. produced, to a cyclical system where the wastes are. reused as energy or raw materials for another product. or process.