a.What does “seven earths” as implied in verse 12 surah at-Talaq actually mean?

b.Why does the Quran use only a singular noun(al-ardhu) when describing the earth(or seven earths) in this case whereas when describing seven heavens a plural noun (as-samawat) is used?

c.Is the word as-samawat introduced by the revelation of the Quran i.e. it was not known to be used before(maybe the Arabs only used the word as-sama’ before the Quran was revealed)?

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http://www.jiskha.com/display.cgi?id=1304166028