1-2. formation & evolution of the earth
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1-2. FORMATION & EVOLUTION OF THE EARTH
http://www.astexhibits.com/earth-day-4222013-is-almost-here/
The Physical Characteristics of the Earth
Distance to the SUN: 149,6000,000 km Diameter: 12,756 km Mass: 5.98*1027 g Density: 2-3g /cm3 (Crust), 5.52g/cm3 (Bulk) Elemental abundance:
Bulk: Fe > O > Si > Mg > Ni > Ca > Al > S Crust: O > Si > Al > Fe > Ca > Na > K > Mg Atmosphere: N > O > Ar > C > H
http://www.ucl.ac.uk/EarthSci/people/lidunka/GEOL2014/Geophysics7%20-%20Deep%20Earth/Earth%20Structure.htm
Internal structure of the Earth.
Key Questions
How did it start to aggregate? What were the heat sources for the
reconstitution (to have such an concentric internal structure)?
Where did the atmosphere and water (volatiles) come from?
How did the life begin and bring the changes of the environment?
Formation & Evolution of the Earth
http://ay201b.files.wordpress.com/2011/04/proplyd_concept.jpg
http://sciexplorer.blogspot.kr/2011/03/earth.html
Collison between Theia & Protoearth
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