In geology, a graded<span> bed is one </span>characterized by<span> a systematic change in grain or clast size from one side of the bed to the other. Most commonly this takes the form of normal grading, with coarser sediments at the base, which grade upward into progressively finer ones.</span>
Change the pressure and/or the temperature of the gas.
She must wear a mask and gloves.
The mask would prevent her from inhaling pathogens that get transferred viraly, while latex gloves would prevent pathogens from entering through her skin, or if she later decides to put her fingers in her mouth or anything similar.
If she has a wound on her hands, the gloves will also prevent the blood from mixing with her own and prevent disease.
