You're right.
In some contexts Earth is capitalized. However the others are always capitalized. They are geographic regions and proper nouns.
Earth is often capitalized when referred to as one of the planets.
http://dictionary.reference.com/browse/earth
Which of the following should NOT be capitalized?
A. Europe
B. the Earth
C. Far East
D. the South Atlantic
I think it's B?
3 answers
Correct.
http://grammar.ccc.commnet.edu/grammar/capitals.htm
http://grammar.ccc.commnet.edu/grammar/capitals.htm
thank u guys