A CCD camera and a laser measure the properties of these substances in the CLidar (KLYE-dar) technique. A quantity characterizing these substances is denoted by lowercase g and is calculated by an intensity-weighted integral over all azimuthal angles. NASA's MODIS instrument measures the asymmetry parameter and optical depth of these substances, which may be classified into an “accumulation mode” or a “coarse mode” based on size. In aggregate, the anthropogenic (*) “loading” of these substances has produced a net negative radiative forcing, in part since these substances directly scatter sunlight and provide nuclei for cloud condensation. Volcanic eruptions produce “primary” examples of, for 10 points, what collections of atmospheric particulate matter, a type of colloid in which a solid is dispersed in a gas? ■END■
ANSWER: atmospheric aerosols [prompt on particulate matter before mention; prompt on colloids before mention]
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= Average correct buzz position