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The oldest rocks found on the Earth's surface date back about ________ billion years.
Q1: The absence of a magnetic field on
Q11: The Moon's Orientale and Mercury's _ Basin
Q18: Jupiter's atmosphere is a single huge storm
Q36: When strong solar winds are directed poleward,we
Q43: Phobos and Deimos are probably captured comet
Q54: As a rotating gas cloud contracts,it spins:<br>A)
Q61: The orbit of Mercury is more elliptical
Q64: Compared to Jupiter,the motions observed in Saturn's
Q72: The large canyon of Mars,Valles Marineris,is a
Q74: The main constituent of the Martian atmosphere