Earth's Internal Structure
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Questions and Answers

What is the asthenosphere believed to be?

  • The zone upon which lithospheric plates of the Earth's crust move about (correct)
  • The zone where the Earth's core moves about
  • The zone where the seismic waves travel through the Earth
  • The zone where the Earth's mantle is divided into two layers

    • At what depth can the lower mantle be found?

  • Between 410 km and 2,900 km below the earth's surface (correct)
  • Between 1,000 km and 2,000 km below the earth's surface
  • Between 2,900 km and 3,500 km below the earth's surface
  • Between 100 km and 1,000 km below the earth's surface

    • What is the Gutenberg discontinuity?

  • The border between the crust and the mantle
  • The border between the mantle and the core (correct)
  • The border between the lithosphere and the asthenosphere
  • The border between the inner core and the outer core

    • What is the core of the Earth mainly composed of?

    <p>Mainly of the elements iron and a little silicon, sulfur, and oxygen</p> Signup and view all the answers

    What is the outer core of the Earth?

    <p>A fluid layer about 2,300 km thick and composed of mostly iron and nickel</p> Signup and view all the answers

    How many layers does the core of the Earth have?

    <p>Two layers</p> Signup and view all the answers

    What is the purpose of the Mohorovicic Discontinuity?

    <p>To separate the crust from the mantle</p> Signup and view all the answers

    What is the reason for the rock being solid in the lower mantle?

    <p>Due to the high pressures</p> Signup and view all the answers

    What is the significance of the Gutenberg discontinuity?

    <p>It marks the border between the mantle and the core</p> Signup and view all the answers

    What is the radius of the core of the Earth?

    <p>3,500 km</p> Signup and view all the answers

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