Lec 2 - Earth's Interior

Lec 2 - Earth's Interior - REVIEW LECTURE 2 PLANET EARTH A...

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REVIEW LECTURE 2 – PLANET EARTH: A DYNAMIC SYSTEM The Big Bang – is believed by scientists to have happened 13.7± 0.2 billion years ago The earliest phases of the universe are much debated. Our solar system is part of the Milky Way Galaxy. It contains 8 planets that orbit around a central yellow star (the Sun) The Earth is the third planet from the Sun Our solar system formed about 5 billion years ago when: • An interstellar cloud of gas and dust collected and began to rotate • As it rotated – it contracted – forming a flat disk with matter concentrated at the center • A primordial sum formed in the center. • Cooling and condensation resulted in segregation of nebular material: Inner rocky bodies = Terrestrial planets Outer mostly gas = Jovian planets The Earth developed a layered internal structure: Metals sank to the center Molten rock rose to produce a primitive crust Chemical segregation established the three basic divisions of Earth’s interior: 1. CORE : Inner solid Fe-Ni core (5150 km from surface)
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