HW due 1/11

The planet Earth formed approximately 4.6 billion years ago.  It was created when chunks of rocks and liquids, also known as planetesimals, were circling the Sun and collided.  When two collided, they melted together because the mass was so hot and would form a larger mass.  Eventually, when over 10 billion planetesimals converged, the process stopped and the heavier elements that made up earth, like iron, sunk to the core and the lighter ones, like silicon, stayed towards the surface.

 

Sources:

http://dcn.davis.ca.us/~explorit/science/earth_science.html

http://uk2planets.org.uk/how-did-the-earth-form/

http://365daysofastronomy.org/2010/02/16/february-16th-how-did-the-earth-form/

 

 

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