Lecture 2 - Earth and solar system overview

Lecture 2 - Earth and solar system overview - Geol 1100...

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Geol 1100 – Principles of Geology (Section 1) Lecture 2 – Highlights 25 January 2008 How did the earth form o Big Bang – when did this occur? ___________ billion years Fundamental elements (hydrogen and helium) Gravity pulls together Stars form, atoms squeeze together ( fusion ) to form heavier elements, stars explode ( nova ) and scatter matter, which eventually re-condenses in new stars Our sun is not a first-generation star – it contains more than simply hydrogen and helium o Solar system began forming more than _________ billion years ago Earth is ___________ billion years old Earth, along with other planets condensed from Solar Nebula As we approach the earth from space, we can see distinct “spheres” o Hydrosphere Water covers > 70% of surface Oceans and fresh water o Atmosphere Primarily nitrogen and oxygen o Biosphere o Solid earth o Also, a magnetosphere These different components are not independent – often, they are viewed as part of an
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Lecture 2 - Earth and solar system overview - Geol 1100...

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