Exam 17: Impacts With Space Objects

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Small meteorite impacts create craters with central uplifts,while large impacts create craters with concave bottoms and no central uplifts.

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Venus resembles Earth in size,density,and distance from the Sun,but has a dense cloud cover of CO2. Its air temperature is _________ that on Earth.

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The solar system has 11 known planets in orbit around the Sun.

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The outer planets lie at great distances from the Sun,and are composed mainly of hydrogen and helium gas surrounding rocky cores (except for Pluto);they commonly are orbited by icy moons and rings of icy debris with compositions of water (H2O),ammonia (NH3),carbon dioxide (CO2),and methane (CH4).

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The space between Mars and Jupiter is occupied by ______.

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The most famous of the comets is the one carrying Edmund Halley's name,the man who calculated its orbit in 1682 and predicted its return to the inner solar system.

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When space debris blazes through the Earth's atmosphere as a streak of light or shooting star,it is referred to as a _______________.

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Most of the meteorites collected on the Earth's surface are "irons".

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Halley's comet contains carbon (C),hydrogen (H),oxygen (O),and nitrogen (N)in ratios similar to that in the human body.

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The planets and the asteroid belt orbit the Sun ____________________.

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Evidence for the impact that occurred near Chicxulub,Mexico,includes all but which of the following?

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Abundant large diamonds,also commonly found in meteorites,occur in the K/T boundary clay layer.

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Venus resembles Earth in size,density,and distance from the Sun,but has a dense cloud cover of ______.

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A major comet or meteorite impact occurred in Mexico at the time boundary between the _______________.

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Some students in this class will likely live long enough to see a return of Halley's comet.

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Asteroids are distinguished from meteorites by their composition.

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The Moon has plate tectonics,but no water or agents of erosion,and no life.

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Stony meteorites are less commonly collected than iron meteorites because _______________.

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A comet's tail results from the increased speed that a comet attains as it nears the Sun,leaving some particles behind because of the acceleration of the main mass of the comet.

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Asteroids lie mostly __________________.

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