Briefly explain the atmosphere on Mars
What will be an ideal response?
The Martian air contains 95 percent carbon dioxide, 3 percent nitrogen, and 2 percent argon. That is similar to the composition of air on Venus, but the Martian atmosphere is very thin, less than 1 percent as dense as Earth's atmosphere and 1/10,000 as dense as Venus's.There is very little water in the Martian atmosphere. Liquid water cannot survive on the surface of Mars because the air pressure is too low: Any liquid water would immediately boil away. The polar caps appear to be composed of frozen water ice coated over by frozen carbon dioxide (dry ice). Whatever water is present on Mars is frozen either within the polar caps or as permafrost in the soil.A process that has reduced Mars's atmosphere is the planet's lack of an ozone layer to screen out ultraviolet (UV) radiation. Solar UV photons can break atmospheric molecules up into smaller fragments. Water, for example, can be broken by UV into hydrogen and oxygen. The hydrogen then escapes into space, and the oxygen easily combines chemically with rocks and soil to form oxides. Iron oxide (rust) in the soil gives Mars its reddish landscape.
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A piece of aluminum has density 2.70 g/cm3 and mass 834 g. The aluminum is submerged in a container of oil (oil's density = 0.650 g/cm3). How much oil does the metal displace?
a. 287 cm3 c. 232 cm3 b. 309 cm3 d. 1125 cm3
This photo shows the visible light spectrum of the Sun. Why does it have all those dark lines on it?
A) The dark lines represent wavelengths of light at which atoms near the Sun's surface absorb radiation from the hotter solar interior. B) The dark lines come from sunspots on the Sun, which are dark in color. C) The dark lines are caused by Doppler shifts. D) The dark lines are not real, but rather are artifacts of the photographic process used to record the spectrum.
Heat can be added to air by solar radiation, moisture
A) condensation, or contact with warm ground. B) evaporation, or contact with warm ground. C) condensation, or contact with cool ground. D) evaporation, or contact with cool ground.
A very elastic rubber ball is dropped from a certain height and hits the floor with a downward speed v. Since it is so elastic, the ball bounces back with the same speed v going upward
Which of the following statements about the bounce are correct? (There could be more than one correct choice.) A) The ball had the same momentum just before and just after the bounce. B) The magnitude of the ball's momentum was the same just before and just after the bounce. C) The ball's momentum was conserved during the bounce. D) None of the above statements are correct.