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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alarm reaction. the first stage of the general adaptation syndrome; the response of the sympathetic nervous system to either physical stress or a strong emotional state (see also stress reaction). It is an automatic and instantaneous response that increases the body's capability to cope with a sudden emergency.