Tag: components of earth

Questions Related to components of earth

The term that best describes the shape of the earth is _____________.

geography inside our earth the earth's structure structure of the earth our world components of earth earth and structure

  1. Ellipse

  2. Geoid

  3. Globe

  4. Sphere

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Correct Option: B

How many major tectonic plates does the earth's crust have?

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. Seven

  2. Eight

  3. Three

  4. Four

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Correct Option: A
Explanation:
  • Earth's crust is divided into 7 major and several minor tectonic plates which float on a semi-fluid layer called the asthenosphere. Hence option A is correct.

The uppermost layer over the earth's surface is called the ____________.

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. Crust

  2. Mantle

  3. Outer core

  4. Inner core

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Correct Option: A
Explanation:

The three main layers of Earth include the crust (1 percent of Earth's volume), the mantle (84 percent), and the core (inner and outer combined, 15 percent). The outermost of all these three is the crust. 

Which of the following statement is correct?

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. The crust is thicker in the oceans than the continents

  2. The crust is thinner in the continents than on the ocean floors

  3. The crust is thinner in the ocean floors than the continents

  4. The crust is thicker in the continents than in the ocean floors

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Correct Option: D
Explanation:
  • The average thickness of earth crust at ocean floors- 8 km 
  • The average thickness of earth crust at continents- 32 km
  • Thus the earth crust is thicker at continents as compared to oceans floors.

 Mohorovicic discontinuity is the boundary between ________ and _________.

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. crust and core

  2. mantle and core

  3. crust and mantle

  4. none of these

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Correct Option: C
Explanation:

The Mohorovicic Discontinuity, or Moho is the boundary between the crust and the mantle. This boundary is located at approximately 2891 km depth beneath the Earth's surface. The boundary is observed via the discontinuity in seismic wave velocities at that depth. This discontinuity is due to the differences between the acoustic impedances of the solid mantle and the molten outer core.


The name of the layer of the Earth that separates the crust from the core is the ___?

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. magma

  2. lithosphere

  3. mantle

  4. asthenosphere

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Correct Option: C
Explanation:

Earth mainly consists of four layers namely crust, mantle, outer core and inner core.

Mantle is the widest of all the layers, which is 1800 miles thick. It is composed mostly of silicate rocks rich in magnesium and iron. It is found beneath the earth’s crust. The temperature of this layer is 1600 degrees Fahrenheit at the top to about 4000 degrees Fahrenheit near the bottom.

The Mohorovicic Discontinuity marks the _____ limit of Earth's crust.

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. lower

  2. upper

  3. middle

  4. side

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Correct Option: A
Explanation:

The Mohorovicic Discontinuity marks the lower limit of Earth's crust. It occurs at an average depth of about 8 kilometers beneath the ocean basins and 32 kilometers beneath continental surfaces. Mohorovicic was able to use his discovery to study thickness variations of the crust. He discovered that the oceanic crust has a relatively uniform thickness, while continental crust is thickest under mountain ranges and thinner under plains.

Third layer of Earth which comes after Mantle of Earth is known as __________________.

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. The Inner Core

  2. The Crust

  3. The Outer Core

  4. The Mantle

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Correct Option: C
Explanation:

Earth mainly consists of four layers namely crust, mantle, outer core and inner core:

Crust: This is about 8 km thick inside and is highly explored. The continental crust is composed mostly of granite. The oceanic crust consists of a volcanic lava rock called basalt.

Mantle: It is the largest layer of the Earth which is 1800 miles thick. It is composed mostly of silicate rocks rich in magnesium and iron.

Outer core: It is located beneath the mantle. The outer core is composed of melted metals like nickel and iron.

Inner core: It is composed of an iron-nickel alloy and some light elements.

Layer that lies immediately after the mantle is the outer core.

What is the approximate distance from the surface of the earth to its center?

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. 4,000 miles

  2. 1,000 miles

  3. 40,000 miles

  4. 10,000 miles

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Correct Option: A
Explanation:

The distance between the centre of earth to its surface is called earths radius.

It is approximately 6,371 km or 3,959 miles

In geology the word __________  is used for a surface at which seismic waves change velocity.

components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

  1. continuity

  2. discontinuity

  3. mental

  4. None of these

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Correct Option: B
Explanation:

In geology the word "discontinuity" is used for a surface at which seismic waves change velocity. One of these surfaces exists at an average depth of 8 kilometers beneath the ocean basin and at an average depth of about 32 kilometers beneath the continents. At this discontinuity, seismic waves accelerate. This surface is known as the Mohorovicic Discontinuity or often simply referred to as the "Moho."