Lava Vesuvius between May 14 and June 4, 1737. Serao described "a flow of fiery lava" as an analogy to the flow of water and mud down the flanks of the volcano following heavy rain. The composition of almost all lava of the Earth's crust is dominated by silicate minerals, mostly feldspars, olivine, pyroxenes, amphiboles, micas and quartz. Igneous rocks, which form lava flows when erupted, can be classified into three chemical types: "felsic", "intermediate", and "mafic" (four if one includes the super-heated "ultramafic"). These classes are primarily chemical, however, the chemistry of lava also tends to correlate with the magma
Body substance isolation a part of the National Standards Curriculum for Prehospital Providers and Firefighters. Types of body substance isolation included: It was postulated that BSI precautions should be practiced in environment where treaters were exposed to bodily fluids, such as: Such infection control techniques that were recommended following the AIDS outbreak in the 1980s. Every patient was treated as if infected and therefore precautions were taken to minimize risk. Other conditions which called for minimizing risks with BSI: or any combination of the above. Body substance isolation Body substance isolation is a practice of isolating all body substances (blood, urine, feces, tears,