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(L02)Earth_In_Context_E10

(L02)Earth_In_Context_E10 - The Earth in Context GLY 2010...

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1 The Earth in Context GLY 2010 – Summer 2010 Lecture 2
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Nebular Hypothesis 2
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Painting of Nebula 3 An artistic impression of the nebula disk of gas and dust from which the planets in our solar system grew Image: Don Dixon
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Collisions Between Planetesimals Don Dixon’s impression of collisions between planetesimals – a gravitationally driven mechanism for accretion of the planetary embryos that eventually built the Earth 4
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5 The Earth In Context
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6 Unique Features of the Earth Liquid water oceans Free oxygen in the atmosphere
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7 The Earth Is a Differentiated Planet - It Has Layers
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8 Early Atmosphere Earth’s original atmosphere - Hydrogen and Helium Light elements escape Earth’s current atmosphere is secondary and evolved from other processes
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9 Outgassing Early volcanism emitted gases into the atmosphere Present day volcanic gas composition Water Vapor ~ 50--60% Carbon Dioxide ~ 24% Sulfur ~ 13% Nitrogen ~ 5.7% Argon ~ 0.3%
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10 Earth’s Atmosphere Today
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