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Acid rain
Acid rain is defined as any
type of precipitation with a
pH that is unusually low.
Dissolved carbon dioxide
dissociates to form weak
carbonic acid giving a pH of
approximately 5.6 at typical
atmospheric concentrations
... > full story
Humus
Humus is a complex organic
substance resulting from the
breakdown of plant material
in a process called
humification. This process
can occur naturally in soil,
or in the production of
compost. Humus is extremely
... > full story
Soil pH
Soil pH is an indication of
the alkalinity or acidity of
soil. It is based on the
measurement of pH, which is
based in turn on the
activity of hydrogen ions
(H+) in a water or salt
solution. ... > full story
Nitrogen oxide
NOx is a generic term for
the various nitrogen oxides
produced during combustion.
They are believed to
aggravate asthmatic
conditions, react with the
oxygen in the air to produce
ozone, which is also an
... > full story
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Sulfur dioxide
Sulfur dioxide (also sulphur dioxide, sulfurous anhydride or sulphurous anhydride) has the chemical formula SO2. The gas is irritating to the lungs and is frequently described as smelling of burning ... > more -
Fertilizer
Fertilizers or fertilisers are compounds given to plants with the intention of promoting growth; they are usually applied either via the soil, for uptake by plant roots, or by foliar spraying, for ... > more -
Air pollution
Air pollution is a broad term applied to any chemical, physical (particulate matter), or biological agent that modifies the natural characteristics of the atmosphere. The atmosphere is a complex, ... > more -
Automobile emissions control
Automobile emissions control covers all the technologies that are employed to reduce the air pollution-causing emissions produced by ... > more -
Water pollution
Water pollution is a large set of adverse effects upon water bodies (lakes, rivers, oceans, groundwater) caused by human activities. Although natural phenomena such as volcanoes, storms, earthquakes ... > more -
Eutrophication
Eutrophication is the enrichment of an ecosystem with chemical nutrients, typically compounds containing nitrogen, phosphorus, or both. Eutrophication can be a natural process in lakes, occurring as ... > more
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