I would say the answer is emissions. These are the particles that are not supposed to be present in air but due to the production of different substances from humans daily activities these substances go with the air we breath. Hope this helped.
Altitude. Rainfall, a hot dry day, and a hurricane are all examples of weather, not climate.
The formula of the ppt. formed is PbSo4 , which is inslouble.
If you clear volume in the density equation:

The greater the density the lower the volume. This means, the volume of gold nugget will be smaller than the volume of iron pyrite nugget.
