Solar
Power
.
The
____________________
is
the
oldest
____________________
of
heat
.
Today
it
is
____________________
to
make
electricity
.
Light
from
the
____________________
is
____________________
with
____________________
panels
.
These
are
large
panels
on
the
roofs
of
buildings
.
They
turn
the
____________________
into
____________________
.
This
electricity
is
used
to
give
heat
and
energy
.
Hydro
Power
.
Have
you
ever
seen
Niagara
Falls
?
Powerful
,
aren't
they
?
We've
used
river
____________________
for
over
2
,
000
years
to
make
____________________
.
Today
huge
dams
are
____________________
on
waterfalls
.
Turbines
are
____________________
by
the
falling
____________________
,
and
electricity
is
____________________
.
It
is
called
____________________
power
.
