2_origin_of_the_oceans [Autosaved] - • Theory of the Big...

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Without the Earths unique chemistry we would not have oceans. How did Earth end up with this chemistry? Comparison of the atmosphere/climate of 3 close planets (Venus, Earth, Mars) Distance from Sun Planet size Atmospheric thickness and composition Average planetary temperatures. Reading: Introduction to Ocean Sciences, 2 nd Ed., Segar, pp. 7 to 12
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Goldilocks problem: Venus is too hot, Mars is too cold, Earth is just right!
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Earth: The Blue Planet or the Water Planet Most of water either a gas (clouds), liquid (oceans, lakes, rivers etc) and solid (ice) as Earths average temperature is ~15 degrees Celsius.
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Why is there liquid water present on planet Earth, but not on Venus or Mars? Relate your answer to the average temperature of the planets, atmospheric thickness and content and distance from the sun.
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So Earths unique chemistry plays an important role in creating a habitable planet. Lets look at how the Earth ended up with this particular assortment of elements.
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Unformatted text preview: • Theory of the Big Bang o Proto-sun, Proto-Earth o Condensation of gases o Rocky planets vs gas giants Thurman, Fig 2-5 • Solar wind blew away H & He from the 4 inner planets (Mercury, Venus, Earth & Mars). • Contraction & radioactivity of 4 inner planets boiled away remaining light gases. • Lost gas was collected by huge planets beyond Mars Rocky Planets Gas Giants • Early Earth History – Planetary differentiation – Origin of the oceans Planetary Differentiation Planetary Differentiation Thurman, Fig 2-6 But liquid oceans could not form on a molten planet…. 1. Gases emitted from the molten Earth form an atmosphere. 1. Earths surface cools allowing water vapor to condense. 1. Sufficient water vapor had condensed by 4 billion yrs ago to form the first oceans. Thurman, Fig 2-7 Origin of the oceans and atmosphere Food for thought: Why does a rocky planet have an ocean?...
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