First 101 words of the document:
Acid rain rain with a pH below about 6 formed when pollutants
such as sulphur dioxide and nitrogen oxides dissolves.
Exponentially an increase that becomes more rapid with time.
Indicator species the presence of a species that indicates the
quality of the habitat.
Ozone a form of oxygen which can absorb ultraviolet light from
the Sun preventing reaching the Earth.
Pollution the presence in the environment of substances that are
harmful to living things.
Resource chemicals and resources that can be used for the
benfit of humans.