Astronomy Quiz 9 – Flashcards
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Rank the 5 terrestial worlds in order of size small to large
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Moon, Mercury, Mars, Venus, Earth
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Under what circumstance can differentiation occur in a planet
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The planet must have molten interior
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What internal energy source is the most important in continuing to heat the terrestrial planets?
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radioactivity
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The 3 principal sources of internal heat of terrestrial planets are
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Accretion, Differentiation, and Radioactivity
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When we see a region of a planet that is not heavily cratered as other regions, we conclude that
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the surface in the region is younger then the surfaces in more heavily cratered regions
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Volcanism is more likely on a planet that
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Has high internal tempatures
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How did lunar Maria form?
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Large impacts fractured the moons lithosphere, allowing lava to fill the impact basins
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The polar caps on Mars are composed of?
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Mostly solid carbin dioxide and some water ice
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Which of the following show evidence of ancient river beds?
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Mars
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How does seafloor crust differ from continental crust?
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Seafloor crust is thinner, younger, and higher in density
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Why are there fewer large craters on the seafloor then on the continents
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the seafloor crust is younger then the continental crust
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Spacecrafts have landed on all the terrestrial worlds EXCEPT?
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Mercury
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How have we been able to construct detailed maps of surface features on Venus?
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By using radar from spacecrafts that were sent to orbit Venus
