oxygen
is
a
chemical
element
gas
with
no
color
or
smell
very
important
element
what
makes
burning
possible
used
in
hospitals
for
killing
bacteria
to
purify
the
water
produced
by
plants
was
initially
discovered
in
1772
can
be
used
in
smelting
metal
from
ore
Word Tree: Data (Arrays)
ore