It
is
colder
____________________
Antarctica
in
many
parts
of
____________________
USA
.
This
is
because
of
____________________
polar
vortex
-
freezing
air
____________________
wind
from
the
Arctic
.
____________________
rarely
happens
.
There
is
a
____________________
of
emergency
in
____________________
towns
.
Schools
and
businesses
have
____________________
.
People
were
told
not
to
____________________
.
They
were
told
not
____________________
go
outside
or
breathe
the
____________________
air
.
The
temperature
in
a
____________________
of
Minnesota
fell
to
-
60º
Celsius
.
The
Chicago
____________________
and
Niagara
Falls
turned
to
ice
.
The
cold
killed
____________________
people
.
Officials
told
people
to
go
outside
only
if
necessary
.
Freezing
air
can
be
____________________
for
the
skin
.
It
can
cause
breathing
problems
.
____________________
snow
can
also
be
dangerous
.
