Density And Layers Of The Earth

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Density And Layers Of The Earth - Quiz

This quiz is over density and layers of the earth! Please do your best and keep your eyes on your own computer screen!


Questions and Answers
  • 1. 

    What is the most dense layer of the earth?

    • A.

      Crust

    • B.

      Mantle

    • C.

      Outer Core

    • D.

      Inner Core

    Correct Answer
    D. Inner Core
    Explanation
    The most dense layer of the earth is the inner core. The inner core is located at the very center of the earth and is composed mainly of solid iron and nickel. Due to the immense pressure at the center of the earth, the inner core is under extreme compression, causing it to be the densest layer. Despite being solid, the inner core is believed to have a temperature close to the melting point of iron, giving it a unique combination of density and temperature.

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  • 2. 

    How do scientists know what the mantle and core are like?

    • A.

      Direct observation

    • B.

      Robotic equipment

    • C.

      On-site research trips

    • D.

      Seismic waves

    Correct Answer
    D. Seismic waves
    Explanation
    Scientists know what the mantle and core are like through the use of seismic waves. Seismic waves are generated by earthquakes or explosions and can travel through the Earth's layers. By analyzing the speed, direction, and behavior of these waves as they pass through the Earth, scientists can infer the properties and composition of the mantle and core. This method, known as seismology, has provided valuable insights into the structure and characteristics of these deep layers of the Earth.

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  • 3. 

    The mantle can be described as being

    • A.

      Solid

    • B.

      Liquid

    • C.

      Solid rock that flows

    Correct Answer
    C. Solid rock that flows
    Explanation
    The mantle can be described as solid rock that flows because although it is composed of solid materials, it exhibits a behavior known as plasticity. This means that even though the mantle is solid, it can slowly flow and deform over long periods of time due to the high temperatures and pressures present in the Earth's interior. This flow of solid rock in the mantle is responsible for processes such as plate tectonics and volcanic activity.

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  • 4. 

    The two pieces of information that you need to find density are: (Select 2 answers!!!!)

    • A.

      Mass

    • B.

      Weight

    • C.

      Volume

    • D.

      Density

    • E.

      Celsius

    Correct Answer(s)
    A. Mass
    C. Volume
    Explanation
    To calculate density, you need two pieces of information: mass and volume. Mass refers to the amount of matter in an object, while volume refers to the amount of space that object occupies. By dividing the mass of an object by its volume, you can determine its density. The other options, such as weight and Celsius, are not directly related to finding density. Weight is the force exerted on an object due to gravity, and Celsius is a unit of temperature measurement.

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  • 5. 

    What two pieces of equipment do you need to find the density of a lumpy, chunky rock?

    • A.

      Thermometer

    • B.

      Triple beam balance

    • C.

      Metric ruler

    • D.

      Graduated cylinder

    • E.

      Funnel

    Correct Answer(s)
    B. Triple beam balance
    D. Graduated cylinder
    Explanation
    To find the density of a lumpy, chunky rock, you would need a triple beam balance and a graduated cylinder. The triple beam balance is used to measure the mass of the rock, while the graduated cylinder is used to measure the volume of the rock. By dividing the mass by the volume, you can calculate the density of the rock.

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  • 6. 

    This layer has mountains and oceans, and can undergo erosion:

    • A.

      Mantle

    • B.

      Crust

    • C.

      Outer core

    • D.

      Inner core

    Correct Answer
    B. Crust
    Explanation
    The crust is the outermost layer of the Earth and is composed of solid rock. It is the thinnest layer compared to the mantle and the core. The crust is characterized by its diverse topography, including mountains and oceans. It is also the layer that is most affected by erosion processes such as weathering and the movement of water and wind. Therefore, the crust is the layer that can undergo erosion.

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  • 7. 

    Why doesn't the crust sink into the mantle?

    • A.

      It is more dense than the mantle

    • B.

      It is less dense than the mantle

    • C.

      It is warmer than the mantle

    • D.

      The oceans hold it up

    Correct Answer
    B. It is less dense than the mantle
    Explanation
    The crust doesn't sink into the mantle because it is less dense than the mantle. Density is a measure of how much mass is packed into a given volume, and the crust has a lower density than the mantle. This means that the crust is lighter and floats on top of the denser mantle. If the crust were more dense than the mantle, it would sink into it. Similarly, the fact that the crust is warmer than the mantle or that the oceans hold it up are not relevant to why it doesn't sink into the mantle.

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  • 8. 

    Which is denser: continental or oceanic crust

    • A.

      Continental

    • B.

      Oceanic

    Correct Answer
    B. Oceanic
    Explanation
    Oceanic crust is denser than continental crust because it is composed mainly of basalt, which is a denser rock compared to the granite and sedimentary rocks that make up continental crust. Additionally, oceanic crust is thinner and younger than continental crust, which contributes to its higher density. The denser nature of oceanic crust also causes it to sink beneath continental crust at convergent plate boundaries, forming subduction zones.

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  • 9. 

    What are the three layers of the mantle in order of least dense to most dense?

    • A.

      Asthenosphere, lithosphere, mesosphere

    • B.

      Lithosphere, mesosphere, asthenosphere

    • C.

      Lithosphere, asthenosphere, mesosphere

    • D.

      Mesosphere. asthenosphere, lithosphere

    Correct Answer
    C. Lithosphere, asthenosphere, mesosphere
    Explanation
    The correct answer is lithosphere, asthenosphere, mesosphere. The lithosphere is the outermost layer of the mantle and is composed of rigid, solid rock. The asthenosphere is the middle layer and is semi-fluid, allowing for the movement of tectonic plates. The mesosphere is the deepest layer and is the most dense, consisting of solid rock under high pressure and temperature.

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  • 10. 

    This is the most dense layer of the earth:

    • A.

      Mantle

    • B.

      Outer core

    • C.

      Crust

    • D.

      Inner core

    Correct Answer
    D. Inner core
    Explanation
    The inner core is the most dense layer of the Earth. It is a solid, iron-rich sphere located at the center of the Earth. The immense pressure in the inner core causes the iron to be compressed into a solid state, despite its extremely high temperature. The density of the inner core is higher than that of the outer core, mantle, and crust, making it the densest layer of the Earth.

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  • 11. 

    This layer is the crust and the upper part of the mantle:

    • A.

      Asthenosphere

    • B.

      Lithosphere

    • C.

      Mesosphere

    • D.

      Outer Core

    • E.

      Inner Core

    Correct Answer
    B. Lithosphere
    Explanation
    The lithosphere is the correct answer because it is the layer of the Earth that includes the crust and the upper part of the mantle. It is composed of solid rock and is broken into tectonic plates. The lithosphere is responsible for the formation of landforms and the movement of these plates, which leads to earthquakes, volcanic activity, and the creation of mountain ranges.

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