Photographs of the surface of Mars provides evidence that liquid water once flowed on its surface.
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Q13: Earth moves most rapidly in its orbit
Q14: Which of the following statements about comets
Q15: The surface temperature of Venus is so
Q16: Which planets have no moons?
A)Earth and Neptune
B)Mars
Q17: Strong evidence about former existing life has
Q19: The density of the planet Saturn is
Q20: The elements heavier than iron in Earth
Q21: Which of the following about Jupiter is
Q22: The atmosphere of Venus is predominantly
A)carbon dioxide.
B)nitrogen.
C)methane.
D)water
Q23: The brightest object in the sky after
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