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25 Cards in this Set
- Front
- Back
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What 2 acids were generated in the atmosphere due to the impact at the end of the Triassic era (65 My) and what are thewre sources
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nitric and sufuric
(a) atmospheric N, O and water (b) sulfur from vaporized rocks, and water |
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How does the surface temperature change and why after a major asteroid impact?
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first decreases due to dust reflecting sunlight, then increases due to rise of CO
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If oceans become toxic to marine life, it is due to decrease of what gas?
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oxygen
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6. What is main cause of the increased loss of species since the 1600’s?
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loss of habitat
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What is the angle of tilt of the Earth’s spin axis?
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23 1/2
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What happens to a planet’s seasons if there is no moon?
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the would vary significantly over time.
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What is the most direct effect of the Moon on the Earth?
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produces oceans and solid earth tides
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Why is the Moon receding from the Earth?
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tidal friction and shallow seas
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What other 2 aspects of the Earth’s motion does the Moon affect
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slows the spin and stabilizes the tilt
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The tilt of the planet’s rotation axis with respect to the perpendicular to the ecliptic can vary between the extremes 0° and 90°. Between what extremes does the resulting ratio of average yearly solar energy between the poles and equator of a planet lie:
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0 and 1.6
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What environmental factor helped organisms to form hard shells during the CE?
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rise in o2
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Has disparity (the number of phyla) increased or decreased since the CE
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decreased
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Have the number of species (diversity) increased or decreased since the CE?
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increased
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What are the 2 most likely causes of the mass extinctions since the CE?
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asteroid or cometary impact
toxicity of oceans changes in atmospheric composition |
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What happens to the atmosphere during a global glaciation?
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becomes decoupled from the oceans
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What happens to prokaryota during a global glaciation
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they retreat to undersea locations or into the crust
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What happens to eukaryota during a global glaciation
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hey die off due to changed geochemistry, surface temperature
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What happens to the oceans during a global glaciation?
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become toxic from dissolved metals
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what is thew age of the universe and solar system
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13.5 by 14 by
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why is the solar system a disk
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conservation of angular momentum + gravity eventually forces all material into a flattened
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what elements are found at the core
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Fe and Ni - heavier elements
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what are the 3 domains that combine to form the Tree of Life:
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Bacteria, Eukaryotes, & Archaea
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what is the big advantage of sexual reproduction in organisms:
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variation and progression
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what compounds are the greenhouse 'gases':
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Co2, methane, nitrous oxide
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what would be the critical spectral signatures of a planet with
organic life |
water vapor, co2, ozone
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