Our
____________________
change
over
time
.
The
causes
of
these
changes
are
due
to
natural
____________________
and
human
____________________
.
Natural
changes
are
produced
by
____________________
factors
such
as
:
weathering
,
____________________
and
deposition
.
____________________
activities
are
caused
directly
or
indirectly
by
humans
:
deforestation
,
____________________
,
pollution
and
forest
____________________
.
It's
important
to
take
care
of
our
____________________
because
we
need
it
for
living
and
there
are
a
lot
of
____________________
things
that
need
it
too
.
