AY 101 Exam 2 Study Guide

A absorbs suns ultraviolet radiation and x rays b

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a) absorbs sun's ultraviolet radiation and x-rays b) keeps earths surface warm, allowing water to stay liquid what two molecules makeup most of earth's atmosphere and where do they come from? 1. nitrogen - outgassed from volcanoes and biological decay 2. oxygen - plant breath what is the main source of heat for the earth's atmosphere? sunlight where and why does the earth's atmosphere absorb light (heat) from the sun? a) ozone layer b) O3 is hot and transparent to ultraviolet light what are some examples of greenhouse gases? - water vapor - H20 - carbon dioxide - CO2 - methane - CH4 what gas is the most responsible for increasing our global warming? carbon dioxide - CO2 what is the evidence for global warming on earth? human activity is correlated with amount of greenhouse gases, which causes temperature to rise - sea level rise, global temperature rise, warming oceans, shrinking ice sheets, glacial retreat, extreme events, ocean acidification where is the bulk of carbon dioxide on earth's surface? in the atmosphere could the earth's atmosphere ever get as thick and hot as venus? no, carbon dioxide on earth is locked away in carbonate rocks due to the presence of water
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how does the ozone later in the earth's atmosphere protect us? absorbs ultraviolet light and x-rays from the sun what has been destroying the ozone later in the earth's atmosphere? chlorofluorocarbons what drives the earth's weather? - planet's geology - plate tectonics - carbon dioxide cycle which gas in our atmosphere is most responsible for increasing global warming? carbon dioxide which gas is most responsible for greenhouse effect? water vapor what is the next threat for global warming? methane why doesn't the moon have an atmosphere? it is too hot and the gravity is too weak for an atmosphere easiest way to tell which areas of the moon are younger than the others? look at the cratering density in each area why do mercury and the moon have virtually no atmospheres? gravity is too weak for how hot they are why does the moon have many more impact craters than the earth? - it doesn't have erosion - moons density is lower how did the earth-moon system form? why do we think so?
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a giant impact between earth and a huge planetsimal what are the dark patches on the moon?
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