A blue planet protected by a thin layer of atmosphere

A blue planet protected by a thin layer of atmosphere.
It keeps temperature, air, and water in perfect balance to maintain life.
In the cold depths of space, this planet is a virtual Paradise,
the only one known of its kind, and it is our planet: Earth.

Data source:
http://www.isabelperez.com/webquest/climate/transcript_warming.htm

HINTS
(A blue) planet
(protected by a thin layer of atmosphere).

It
keeps
temperature, air, and water (in perfect balance) バランス上
(to maintain life). 生命を維持する

(In the cold depths of space,)
this planet
is
a (virtual) Paradise,
the only one (known of its kind),

and
it
is
our planet: Earth.


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