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Solar System Revision
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What makes up the atmosphere of Venus?
carbon dioxide
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Why are Ceres, Pluto, Eris, Makemake, and Haumea classified as dwarf planets?
Each of the dwarf planets is spherical, orbits the Sun, and has objects of similar mass that are orbiting nearby or crossing its path.
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Which planets have a small amount of methane in their atmospheres?
Uranus, Neptune
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What happens when a meteoroid strikes a moon or a planet?
impact craters
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Which planet has a tilted axis of rotation?
Uranus
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Which outer planets have periods of rotation that are shorter than Earth’s?
Jupiter, Saturn, Uranus, Neptune
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Which planet takes 165 years to orbit the Sun?
Neptune
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Why is Venus the hottest inner planet?
Its atmosphere traps a lot of heat energy.
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chunks of rock and ice that orbit the Sun between Mars and Jupiter
asteroids
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Comets form a glowing tail when
the Sun’s energy changes their ice into a gas and makes it glow.
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Which planets have atmospheres composed of hydrogen and helium gases?
Jupiter, Saturn, Uranus, Neptune
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Which planet has the largest and most complex ring system?
Saturn
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Which inner planet has the longest period of revolution and why?
Mars, because it is farthest from the Sun
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What causes great dust storms on Mars that last for months?
Winds on Mars sometimes produce great dust storms
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Io, Europa, Ganymede, and Callisto are called the _____________ .
Galilean moons
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What covers the surface of Mercury?
impact craters, smooth plains of lava, high cliffs
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Which two metals make up the core of Mercury?
Iron and Nickle
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Earth is the only planet with a wide variety of life because of its
moderate temperature and liquid water.
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Which planet has a core that might be the size of Earth and ten times its mass?
Jupiter
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Why does Mercury not have an atmosphere?
gravity not strong enough to hold gases close to its surface
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