Biogeochemcial
Cycling
of
Elements -
The
main
building
elements
of
organisms
are
carbon,
hydrogen,
oxygen,
nitrogen,
sulphur
and
phosphorus.
Growth
of
an
organism
involves
the
conversion
of
these
elements
present
in
an
inorganic
form
to
the
organic
compound
that
make
up
the
living
matter.
The
energy
for
this
elemental
conversion
is
ultimately
derived
from
solar
sources
of
photosynthesis.
If
this
were
the
only
process,
life
would
soon
cease
as
the
inorganic
forms
of
elements,
particularly
carbon
and
nitrogen
would
be
locked
into
organic
matter.
In
fact,
the
reverse
process
mineralisation
must
also
occur
and
is
brought
about
by
the
activity
of
living
organisms
so
that
cycles
of
elements
and
matter
occur.
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