Earth's Structure and Composition

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Questions and Answers

Which of the following best describes the composition of Earth's core?

  • Composed mainly of iron and nickel in its entirety. (correct)
  • Primarily silicon and oxygen, with trace amounts of iron.
  • A rocky composition with a liquid outer layer.
  • Dominated by water ice and frozen gases.

What is the primary characteristic of the Earth's outer core, differentiating it from the inner core?

  • It is non-magnetic, composed of heavier elements.
  • It is composed of lighter elements like aluminum and magnesium.
  • It is solid, due to the intense pressure.
  • It is liquid and responsible for Earth's magnetic field. (correct)

The Earth's volume is mostly composed of which layer?

  • The inner core comprised of iron and nickel.
  • The outer core with its magnetic field.
  • The crust, due to its vast surface area.
  • The mantle at approximately 84.1%. (correct)

What is the approximate thickness of the liquid outer core?

<p>2,230 km (D)</p>
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Which dynamic process occurring within the Earth's interior is most directly responsible for generating the planet's magnetic field?

<p>Convection currents in the liquid outer core. (C)</p>
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Which of the following statements accurately describes the Earth's crust?

<p>It mainly consists of lighter elements such as aluminum, silicon, calcium, and oxygen. (B)</p>
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What is the main function of the asthenosphere (mantle of acromina) within the Earth's structure?

<p>To facilitate the movement of magma, leading to tectonic plate movement. (A)</p>
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About what percentage of Earth's total volume is represented by the crust?

<p>1-4% (B)</p>
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How does the hydrosphere manifest on Earth?

<p>Through water in continents and oceans. (C)</p>
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Which of the following lists of elements would most accurately describe the elements that make up the Earth's crust?

<p>Aluminum, Silicon, Calcium, Oxygen (A)</p>
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Flashcards

Earth's Core

Earth's innermost layer, primarily composed of iron and nickel.

Outer Core

The outer core is a liquid layer composed mainly of iron and nickel.

Outer Core Thickness & Magnetic Field

The thickness of the outer core is approximately 2,230 km and its movement generates Earth's magnetic field.

Core Division

The Earth's core is divided into a solid inner core and a liquid outer core

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Core Volume

The Earth's core makes up approximately 84.1% of the Earth's volume.

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Earth's Crust

The Earth's outermost layer, made of lighter elements like aluminum and silicon.

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Mantle

The layer beneath the crust where magma movement drives tectonic plate shifts.

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Asthenosphere

A region within the mantle that facilitates tectonic plate movement.

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Crust Volume

Accounts for 1-4% of Earth's total volume.

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Hydrosphere

The Earth's water layer, existing in oceanic and continental forms.

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