Meningitis is a disease caused by the inflammation of the protective membranes covering the brain and the spinal cord. While most people with meningitis recover, it can cause serious complications, such as brain damage, hearing loss or learning disabilities. A vaccination is the most effective way to protect yourself against certain types of meningitis.
Primary & Secondary pollutant. Definition: A primary pollutant is an air pollutant emitted directly from a source. A secondary pollutant is not directly emitted as such, but forms when other pollutants (primary pollutants) react in the atmosphere.
Soil air differs from the atmosphere above the soil in that it usually contains 10 to 100 times as much carbon dioxide, slightly less oxygen, and is saturated with water vapor. Soil Air Movement: Air enters and leaves the soil through cracks in the soil and through the pores at the surface of the soil.