The concentration of particles in the air is really small, so the mass units need to be really small as well. We commonly use micrograms instead of milligrams when measuring particle pollution
concentrations. We also need a lot of air, so we use a cubic meter instead of a liter of air. Imagine
a box of air that is one meter on each side. If my filter paper weighs 2.011 milligrams when clean
and 2.023 mg after I pump 1 m' of air through it, what would the concentration of particles be in
pg/m?

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Which property of a rock remains unchanged by mechanical weathering? a. total surface area b. size and shape c. mineral composition d. sharpness