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EPS 102L: Lab 2 Earth History & Composition

EPS 102L: Lab 2 Earth History & Composition. Today: - Geologic timeline - Earth’s composition - Next week: Minerals - Turn in lab 1!. How to make a Planet:. Step 1: Planetary Accretion. From a cloud of dust to a little marble .

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EPS 102L: Lab 2 Earth History & Composition

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  1. EPS 102L: Lab 2 Earth History & Composition Today: - Geologic timeline - Earth’s composition - Next week: Minerals - Turn in lab 1!

  2. How to make a Planet: Step 1: Planetary Accretion From a cloud of dust to a little marble Step 2: Gravitational Separation Materials with a high density tend to sink through lighter materials http://www.astro.psu.edu/users/niel/astro1/slideshows/class43/slides-43.html http://www4.nau.edu/meteorite/Meteorite/Book-GlossaryD.html

  3. Composition of the Earth Two Models for the Composition of the Earth 1.) Layers of different rock strength • Lithosphere • Asthenosphere • Mesosphere • Outer Core • Inner Core Increasing Density

  4. Composition of the Earth Two Models for the Composition of the Earth 2.) Layers of different composition • Continental Crust • Oceanic Crust • Mantle • Core Increasing Density

  5. Core: iron, nickel Mantle: iron, nickel, magnesium Crust: silica, oxygen, aluminum, some iron Inner core: solid Outer core: liquid Mesosphere: hot, rigid Asthenosphere: plastic, deforms easily Lithosphere: cool, rigid COMPOSITION vs. STRENGTH Controlling factor: differentiation during Earth formation according to elemental mass Controlling factors: temperature and pressure increase from surface to interior

  6. http://earthsci.org/processes/geopro/introgeo/introgeo.html

  7. The Earth’s Past • The Earth’s crust is built by many different processes. • How do we make sense of what we see? http://foliasyon.blogspot.com/2010/11/superpozisyon-yasas-law-of.html

  8. The Law of Superposition “Sedimentary layers are deposited in a time sequence, with the oldest on the bottom and the youngest on the top.” - Nicolas Steno How do we know: When a species went extinct? The length of time an species lived on the Earth? What environment existed at the Earth’s surface during a particular time? http://glencoe.mcgraw-hill.com/sites/0078757134/student_view0/unit4/chapter14/standardized_test_practice.html

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