IQ The original atmospheres of Mars and Earth were very similar. T F.

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IQ The original atmospheres of Mars and Earth were very similar. T F

IQ T. It is true! Both started with a CO 2 -rich atmosphere. Water and temperature caused differences to occur in the present-day atmospheres.

IQ Mars never had liquid water on its surface. T F

IQ The correct answer is F, false. Mars shows much evidence for surface water flows. There appears to be no liquid water on the surface today, But there is water ice!

IQ The Viking Landers found conclusive evidence for primitive life. T F.

IQ False! The search for biological activity carried out by the Viking Landers were negative, but inconclusive. Look closely, you can just see an elephant hiding behind the most distant tree!

IQ Mars has no atmosphere. T F

IQ F. Yes, indeed, Mars does have an atmosphere! The atmosphere is tenuous, and mostly CO 2. Dust storms and clouds are commonly observed on Mars.

IQ The largest volcano in the solar system, a result of no tectonic activity, is found on Mars. T F

IQ T! True. Olympus Mons is the largest volcano in the solar system. It is three times higher than Everest!