In contrast, Venus's thick clouds block most sensors on orbiting spacecraft, and those that venture too far below the cloud deck face sulfuric acid droplets, scalding temperatures, and crushing pressures. (sciencemag.org)
A volcanic cloud contains two kinds of aerosols: sulfuric acid droplets converted from SO2 and silicate volcanic ash. (sciencedaily.com)
Volcanoes, which have produced some of the most spectacular sunsets in history, can inject sulfuric acid droplets into the stratosphere, the layer of the atmosphere between 10 to 35 miles in altitude. (scientificamerican.com)