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20 Cards in this Set
- Front
- Back
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What two elements are found in the core of terrestrial planets.
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Fe, Ni
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What four elements were in the original mantle and crust
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Ca, Mg, Al, Si
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What fourd elements were brought to early Earth from cometary impacts
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NOCH
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What 2 elements outgassed from the interior to form the early atmosphere.
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C,O
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What 2 elements outgasses from the interior to for the early ocean
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H, O
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What 2 elements were formed in the big bang
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H, He
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What was the main gas forming the original atmosphere of Earth
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CO2
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Where did life probably start on Earth
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Volcanic vents, mid ocean ridges
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what life forms were the original inhabitants of Earth
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extremophiles or archaens
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What is the benefit of a planetary magnetic field to complex life
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protects organisms from radiation from sun, may be associated with plate tectonics
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What is the main temperature requirement for a habitable zone to exist?
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Water must be liquid and temperatures must be moderate T<50 T>0
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What are other HZs for Archaea
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Mars, Europa, moons of gaseous planets
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Is there a time requirement for an HZ with respect to the stars lifetime
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the star must be in its stable, H - burning phase
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name 6 environments in the galaxy where HZ's are probably rare
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1. Galactic Centers
2. Globular Clusters 3. Binary and multiple Star systems 4. Around exotic objects (neutron stars,white dwarfs, black holes) 5.elliptical galaxies 6.edges of galazies |
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What terrestrial planets have a strong magnetic field
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Earth and Mercury
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where does plate material originate
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mid ocean ridges
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where is plate material is consumed
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subduction zones
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where are volcanoes usually located
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back arc basin
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How does PT affect the Carbon Cycle
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PT provides a mechanism to recycle CO2 from sediments to volcanoes
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What other benefits are there to PT for complex life forms
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a. reorganizes plates for bio-diversity
b. continental growth forms stable land masses c. indirectly provides shelf areas for marine life |
