First 109 words of the document:
Atmospheric pollution contaminates of the environment that are
a by-product of human activity. They include particles (smoke)
and gases such as sulphur oxide.
Combustion burning of a substance with oxygen to release
energy. Another word for burning.
Deforestation destruction of forests caused by excessive cutting
down of trees.
Photosynthesis the process in which plants convert water and
carbon dioxide into oxygen and glucose using the energy from the
Respiration a process that takes place in living cells converting
glucose and oxygen into water and carbon dioxide with a release