How is built-up residual air in the SCBA released when replacing the air cylinder?

Which spectra in the figure below is made by a hot tenuous gas? What are the uses of Flurite Halite Graphite Calcite and Quartz? Why do so many species live in tropical rain forest? What structure routes air and food into their proper channel and plays an important role in speech production? When and where did the Mount Tambora eruption happen? If severe weather or a transport problem? Where is young plants and flowers reared? What are the cell organelles that are located within the uncleus? What are the phases of matter in the mantle? How many atoms is AlCl made of? What is a disease in cattle associated with prions? What stimulates a person's body to produce chemicals that destroy vireses or bacteria? Chlorine has an atomic number of 17 an an atomic mass of 34 when chlorine becomes the chloride ion its charge is what? How blood circulate to the legs? The small structures in the cell that carry out the cell's activities are known as? What are three countries located on the equator? Which type of landform develop at plate boundaries where one oceanic plate descend beneath another? What is The form of DNA decrisbed as disorganized strands of nucleotides? When was gonorrhea discovered? Is Neptune's dark spot cold?