NATS 1880 Lecture Notes - Lecture 1: Outer Core, Late Heavy Bombardment, Outgassing
27 Aug 2015
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Document Summary
Just because planet has atmosphere, doesn"t mean it"ll keep its atmosphere. Outgassing from the earth"s interior likely started shortly after formation of planet. Substantial amounts of volatile material likely deposited on earth from impacts of objects from the cooler outer regions of the solar system. The oceans formed from outgassed material and the planetesimals. Between 4. 1 and 3. 8 billion years ago, a substantial amount of planetesimals rained down on the inner solar system, probably due to. The moon retains scars of these impacts with the lunar highlands being older than the lunar marie (seas) 78% nitrogen, 21% oxygen and 1% of other gases mostly water vapour, but also includes co2, methane, argon and helium. The big change is an indication of the presence of life. Life appears to have gained a foothold at the time of the hadean. Plate tectonics has continued because of convective currents in the.
