water life fifth poles home surface third
The
Earth
is
our
planet
.
It
is
the
planet
from
the
Sun
.
It
is
the
-
largest
planet
in
the
Solar
System
.
It
is
a
sphere
,
but
it
is
slightly
flattened
at
the
.
It
has
a
solid
with
mountains
,
valleys
,
plains
,
etc
.
It
is
the
only
known
planet
with
large
amounts
of
liquid
.
It
is
the
only
planet
known
to
support
.
oceans oxygen distance water atmosphere temperature life
Life
on
Earth
The
Earth
is
the
only
planet
in
the
Solar
System
with
the
conditions
for
to
exist
.
These
conditions
are
:
The
from
the
Sun
is
just
right
for
water
to
remain
in
a
liquid
state
.
The
is
not
too
hot
and
not
too
cold
.
Liquid
is
essential
for
all
life
on
Earth
.
It
covers
more
than
70%
of
the
Earth's
surface
.
Most
of
it
is
salt
water
in
the
.
The
is
the
layer
of
gases
that
surrounds
the
Earth
.
It
keeps
the
Earth's
surface
at
a
comfortable
temperature
.
It
contains
the
that
we
breathe
.
Sun axis
Movements
of
the
Earth
The
Earth
moves
in
two
different
ways
.
It
spins
on
its
and
it
travels
around
the
.
rotation day night axis daytime
Rotation
The
Earth
spins
or
rotates
on
its
own
.
The
Earth
takes
one
(
about
24
hours
)
to
complete
one
spin
.
Day
and
night
are
caused
by
the
Earth's
.
?
It
is
on
the
side
of
the
Earth
that
faces
the
Sun
.
?
It
is
-
time
on
the
side
that
faces
away
from
the
Su
n
summer orbit Seasons Sun winter year
Revolution
The
Earth
orbits
or
revolves
around
the
.
The
Earth
takes
one
(
about
365
days
)
to
complete
one
around
the
Sun
.
occur
because
the
Earth's
axis
is
tilted
and
it
always
points
in
the
same
direction
.
?
In
,
the
Northern
Hemisphere
is
tilted
away
from
the
Sun
.
?
In
,
the
Northern
Hemisphere
is
tilted
towards
the
Su
n