Astronomy

Astronomy - Astronomy 3/27/2008 5:33:00 PM ridges in the...

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Astronomy 27/03/2008 16:33:00 ridges in the middle of oceans are places where hot mantle material rises up and  spreads sideways pushing the plates apart lithosphere= the rigid rocky material of crust and uppermost portion of mantle convection= process in which bubbles of gas move upward through a liquid avg. surface temp= venus bc of its dense carbon dioxide atmosphere solar nebula heated up as it collapsed bc as the cloud shrank its gravitational  potentional energy was converted to thermal energy terrestrial planets formed inside the frostline while jovian planets formed outside  it where ices could condense.  The terrestrial planets were too small in mass to accrete  and retain any gas the current atmospheric concentration of carbon dioxide on earth is at its highest  in over 1 mill yrs 2% of mass of solar nebula consisted of elements other than hydrogen and 
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Astronomy - Astronomy 3/27/2008 5:33:00 PM ridges in the...

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