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HISTORY OF THE EARTH

HISTORY OF THE EARTH - HISTORYOFTHEEARTH I Origin (...

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HISTORY OF THE EARTH   I. Origin                The great order in motion of the solar system indicates that it all formed together  (nebular hypothesis already covered)             The age of Earth's crust, the oldest moon rocks and meteorites are all similar and  suggest an age of about 4.6 years   II. Differentiation of the Earth               Early melting of the Earth allowed it to separated into a core, mantle and crust.   Core              Dense (iron and nickel) and about 1/2 the diameter of the Earth           Mantle  Less dense and rich in magnesium, iron, silicon and oxygen (not the kind you  breath) Crust  The least dense and is silicon and aluminum-rich              Ocean crust   average about 5 km thick             Continental crust   average about 35 km thick
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