Types
of
energy
There
are
____________________
main
types
of
energy
resources
.
These
are
renewable
and
____________________
-
____________________
energy
sources
.
Renewable
energy
sources
are
those
which
will
not
run
out
and
can
be
used
over
again
.
These
include
wind
,
tidal
and
____________________
energy
.
Non
-
renewable
energy
sources
can
only
be
used
once
.
They
take
millions
of
years
to
form
e
.
g
.
oil
,
____________________
and
natural
gas
.
Some
resources
are
thought
to
be
both
renewable
and
non
-
renewable
.
These
are
:
wood
-
when
wood
is
used
for
fuel
and
replanted
it
is
a
form
of
renewable
energy
.
____________________
-
changing
farming
wastes
,
grasses
,
trees
,
bark
,
sawdust
,
and
other
things
into
energy
by
burning
it
,
changing
it
to
a
gas
,
or
converting
it
to
a
liquid
____________________
.
