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The Earth is a System
 

The Earth is a System

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    The Earth is a System The Earth is a System Presentation Transcript

    • THE EARTH IS A SYSTEM
    • Earth’s Principal Systems  Atmosphere  Hydrosphere  Biosphere  Lithosphere  Magnetosphere  Cryosphere
    • Fig. 1-1, p. 5
    • Interaction Among Earth’s Systems Table 1-1, p. 4
    • HOW DOES GEOLOGY AFFECT OUR LIVES?
    • Resources Used by Each Person Fig. 1-3, p. 8
    • Geology and Monuments  Statue of Liberty  Mount Rushmore  Cave of Lascaux  Treasury at Petra  Statue of David  Eifel Tower  Egyptian Pyramids
    • WHEN WAS THE EARTH FORMED?
    • Formation of Solar System Accretion Disk
    • Earth’s Formation  The Earth was formed about 4.5 billion years ago, from the solar accretion disk.
    • Formation of Earth’s Layers  Meteorite Impacts  Gravitation Compression  Heat from Radioactive Decay  Formation of Nickel / Iron Core  Surface Cooling and Formation of Plates  Comet Impacts bring Water
    • WHERE IN THE UNIVERSE IS EARTH?
    • 3rd Planet From the Sun – 93,000,000 miles
    • Milky Way Galaxy  It is part of a fairly large spiral galaxy consisting of about 200 billion stars.  Yellow line indicates path of Earth as the galaxy rotates.
    • WHAT IS THE SHAPE OF THE EARTH?
    • Geoid – Not Quite Round, Not Quite Elliptical
    • WHAT IS THE EARTH’S STRUCTURE?
    • 35 km (21 mi.) avg., 1,200˚C Layered Crust Sphere 100 km (60 mi.) Low-velocity zone 200 km (120 mi.) Crust Mantle Solid Lithosphere 10 to 65km 2,900km 100 km Asthenosphere (1,800 mi.) (depth unknown) 3,700˚C Outer core (liquid) 200 km Core 5,200 km (3,100 mi.), 4,300˚C Inner core (solid)
    • Earth’s Interior Divisions Earth's Interior Divisions Layer Outer Approx. Compos Name Radius Temp. ition in km Inner 1229 7000 deg. C Solid Core Iron Outer 3484 5000 deg. C Liquid Core Iron Lower 5700 2000 deg. C Iron- Mantle rich Rock Upper 6360 500 deg. C Iron- Mantle rich Rock Crust 6371 0 deg. C Basalt, Granite
    • WHAT GEOLOGIC PROCESSES OCCUR WITHIN THE EARTH’S INTERIOR?
    • Geological Processes  Plate Tectonics  Heat Transfer  Soil Erosion  Mineral Deposition
    • Fig. 1-10, p. 16
    • Fig. 1-11, p. 17
    • Fig. 1-12, p. 18
    • Connections between the Plates and Earth Systems Table 1-3, p. 18