In
this
____________________
called
____________________
The
Earth
revolves
____________________
the
Sun
.
The
Earth
takes
____________________
____________________
(
one
year
)
to
orbit
the
Sun
.
For
this
movement
,
some
parts
of
the
Earth
receive
more
____________________
than
others
____________________
____________________
____________________
.
This
produces
the
four
____________________
:
spring
,
summer
,
autumn
and
winter
.