What causes metamorphoic rocks to form from existing rocks

metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.

clinically, some people often have repeated allergies, eczema and respiratory infections or other parts of the infection, in this case, in addition to some routine tests such as tests for white blood cells, immunoglobulin series, lymphocyte subsets, etc., the five immune immunoglobulin tests are also necessary.