Added on March 16: Reasons for Above Claim

"Until the Apollo missions, many prominent scientists were convinced that the moon was born cold and stayed cold, never melting enough to form a liquid core." (Ref. A) Such a liquid core is essential for a long-lasting magnetic dynamo, which in turn is essential for the magnetism found in the "moon rocks". No one ever proved the Moon had a liquid core. (Ref. A)

The Moon has "pockets" or "areas" of "local" magnetism based on the distributed material in the crust, and on the small magnetic fields present in the alloys of ferromagnetic material there (that is, meteorites found ON the Moon) (Ref. B). Such local magnetism could not produce many magnetic "moon rocks" brought back by Apollo astronauts (Ref. A).

Ref. A: [link to www.space.com]
Ref. B:
[link to wiki.answers.com]

Added on March 16: Moon never had an atmosphere, as it had little gravity/magnetic field.

The Moon has no strong gravity or magnetic field, so there's
virtually no reason to expect it to maintain an atmosphere for any appreciable length of time (Ref. C). Anyway, the Moon was far more likely lifeless than otherwise. Or do you think the neuron fossils originated on the Moon?

Ref. C: [link to in.answers.yahoo.com]

Read more at [link to wretchfossil.blogspot.com]