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    Layers of The Earth Notes

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    Girli Josee
    The Earth is made up of three main layers - the crust, mantle, and core. 1) The crust is the thin, solid outer layer ranging from 2-75 miles thick and composed of plates that the continents and oceans rest on. 2) The mantle is the thickest layer, making up 70% of the Earth's mass, and is solid but capable of slow convection currents. 3) The core is at the center and composed of liquid outer core and solid inner core of nickel and iron, and has the greatest temperature, pressure, and density of the layers.

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    Layers of The Earth Notes

    Uploaded by

    Girli Josee
    46 views2 pages
    The Earth is made up of three main layers - the crust, mantle, and core. 1) The crust is the thin, solid outer layer ranging from 2-75 miles thick and composed of plates that the continents and oceans rest on. 2) The mantle is the thickest layer, making up 70% of the Earth's mass, and is solid but capable of slow convection currents. 3) The core is at the center and composed of liquid outer core and solid inner core of nickel and iron, and has the greatest temperature, pressure, and density of the layers.

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    Layers of the Earth Notes

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    The Earth is made up of three main layers - the crust, mantle, and core. 1) The crust is the thin, solid outer layer ranging from 2-75 miles thick and composed of plates that the continents and oceans rest on. 2) The mantle is the thickest layer, making up 70% of the Earth's mass, and is solid but capable of slow convection currents. 3) The core is at the center and composed of liquid outer core and solid inner core of nickel and iron, and has the greatest temperature, pressure, and density of the layers.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    46 views2 pages

    Layers of The Earth Notes

    Uploaded by

    Girli Josee
    The Earth is made up of three main layers - the crust, mantle, and core. 1) The crust is the thin, solid outer layer ranging from 2-75 miles thick and composed of plates that the continents and oceans rest on. 2) The mantle is the thickest layer, making up 70% of the Earth's mass, and is solid but capable of slow convection currents. 3) The core is at the center and composed of liquid outer core and solid inner core of nickel and iron, and has the greatest temperature, pressure, and density of the layers.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 2

    The Earth is made up of 3 main layers:

    • Molten (liquid) metal that is about 4,700°C (8,500°F)


     Crust
    • Located about 1,800 miles beneath the crust and is
     Mantle about 1,400 miles thick
     Core • Composed of the melted metals nickel and iron
    Think of the layers of the Earth like
    the layers of a cake. Inner Core
    • Solid sphere
    composed mostly of
    iron
    Crust Mantle Core • It is believed to be as hot as 6,650°C (12,000°F)
    Less than 1% of 67% of Earth’s 33% of Earth’s • Heat in the core is probably generated by the
    the Earth’s mass mass
    radioactive decay of uranium and other elements
    mass
    • It is solid because of the pressure from the outer core,
    5-100 km thick 2900 km thick 6.856 km in
    mantle, and crust compressing it tremendously
    diameter
    (pressure freezing)

    Crust The Earth is like a peach or a boiled egg. Turn


    • Thinnest layer of to a seat partner and discuss these analogies. Come up
    the Earth that with another analogy and be prepared to share.
    ranges from only 2
    miles in some areas of the ocean floor to 75 miles
    deep under mountains
    • Made up of large amounts of silicon and aluminum
    • Two types of crust: oceanic crust and continental
    crust
    • Composed of plates on which the continents and
    oceans rest
    The Earth’s crust is like the skin of an apple.
    Turn to an elbow partner and discuss why this
    statement is true. Next, come up with another
    example.

    Mantle
    Asthenosphere
    • Solid but
    - a soft layer of
    capable of flow
    the mantle
    (like hot asphalt or fudge)
    on which
    • Thickest layer of the Earth (making up 70% of the
    pieces of the
    Earth’s mass)
    lithosphere move
    • The hot material (magma) in the mantle rises to the
    - made of solid rock that, like putty, flows very
    top of the mantle, cools, then sinks, reheats, and rises
    slowly- at about the same rate your fingernails
    again. These convection currents cause changes in the
    grow
    Earth’s surface
    Upper Mantle- where convection current
    The lithosphere (crust and upper mantle) is
    occurs
    divided into separate plates which move very slowly in
    response to the “convecting” part of the mantle.
    Core
    Outer Core
    Temperature increases as depth increases
    What’s the relationship between depth and
    density/pressure?

    Density and Pressure increase as depth increases

    Which layer of the Earth has the greatest temperature,


    pressure, and density?

    - Core

    SUMMARY

    The earth is layered with a lithosphere (crust and


    uppermost mantle), convecting mantle, and a dense
    metallic core.

    Pressure, temperature, and density increases as depth


    increases.

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