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People I've never heard of are out there digging , looking for pollen grains in lake sediments , or dusting off trilobites from Paleozoic shales . Aspiration of the leg consists of a flow of air across the entire boot , which entrains the liberated dust and carries it up the up-leg to take-off points . During milling , the lead oxide that forms on the surface of the ingots and fine particles of un-oxidized lead are broken off , forming a fine dust that is removed from the mill by a circulating air stream . Also known to cause hypersensitivity pneumonitis are dusts from moldy sugar cane and barley , maple bark , cork , animal hair , bird feathers and droppings , mushroom compost , coffee beans , and paprika . If common regular density silica gel were used , the author 's bag porosity would need to be dramatically reduced to avoid dusting . The Earth Machine explores the major forces and factors that shaped and continue to shape our planet : how Earth emerged from the swirling dusts of a nascent solar system ; how a life-sustaining , oxygen-rich atmosphere developed ; how continents and oceans formed and continue to change ; and how hurricanes , earthquakes , and volcanic eruptions alter Earth 's physical and environmental systems . Magnetically-driven eddies within the gas / dust cloud helped to impart additional angular momentum to the larger condensed rotating objects beyond the spherical Sun ( which possesses only 0.55 % of this momentum even though it contains 99.87 % of the total mass of the system ) . He is known for his research work on atmospheric dust , the formation of dew , cyclones and evaporation . " Now a computer engineer living in Sudbury , Tate remains an active member who looks forward to dusting off her old clarinet case every June . For controlling wood dust exposure , vacuuming is preferred . Even as I speak , old Hansards are being dusted down , trade associations are preparing contracts for their Parliamentary lobbyists , individual firms are preparing their wish-lists , consumer lobbies are gathering outside the St Stephens entrance . The individual dark chocolate souffles , dusted with powdered sugar , were beautiful and delicious . I can give you an example her : the Ministry of Agriculture is , for instance , responsible for large-scale crop dusting , using air-craft ; it consulted us as to whether it should take over private crop dusting planes . Respiratory equipment approved by the Secretary and the Secretary of Health and Human Services shall be provided persons exposed for short periods to inhalation hazards from gas , dusts , fumes , or mist . If trespassers ride off-road vehicles on the gypsum pile , they may be exposed to acidic dusts from the stack or to acid water ponded on top of the stack . General aviation airports support charter flight companies , flight schools , cargo operations , crop dusting services and other businesses . While the 2004 graduate is applying for teaching jobs , he substitute teaches at Sourdough Montessori School where recently , he dusted off his puppetry-making materials and taught some of the three-to-six-year-olds the art of entertainment . An example of public service our society might recognize as worthy of the DPS Medal , are written reports or testimony made to state and federal legislators , to the general public , or to the broader scientific community on topics such as volcanic hazards , mineral resource and waste management policy , science funding , and health effects of mineral dusts and mine effluents . At the center of CP + B 's new marketing effort for Burger King lies a long-retired 30-year-old slogan , " Have It Your Way , " which the agency dusted off as a way to pitch customizable fast food to a mass audience of 18-to-35-year-old men .