| http://www.w3.org/ns/prov#value | - The Moon then formed out of the debris thrown into space by the collision. ??? ??? ??? Volcanic activity on Venus is thought to be: less frequent, but more violent than volcanic activity on Earth. ??? ??? ??? Venus lacks a planetary magnetic field because it rotates very slowly. ??? ??? ??? If Mars' atmosphere is mostly carbon dioxide, why is not it as hot as Venus?
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