Tag: the earth's structure

Questions Related to the earth's structure

Top most layer of the soil is called _________.

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

  1. top soil

  2. core

  3. silt

  4. alluvium

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Correct Option: A
Explanation:

The topmost layer of the soil is called topsoil. This layer is usually fairly loose, porous, dark and rich in humus. The humus is derived from decomposed and partly decomposed organic matters of plant and animal origin in the soil. It plays important role in maintaining the fertility of the soil.

The atmosphere is negligible at a distance of ____________.

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

  1. 180 km

  2. 160 km

  3. 150 km

  4. 100km

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Correct Option: A

A period of the earth's geological history, about 55 million years old, is called __________.

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

  1. The primary age

  2. The secondary age

  3. The tertiary age

  4. None of these

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Correct Option: A
Explanation:

In the earth's ecological history time period which is about 55 million years old was called the primary age.

It is estimated that during this period only the climate event started. during this time configuration of oceans and continents was also different.

Atmosphere of the earth is held by _____________.

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

  1. Frictional force

  2. Reaction force

  3. Electromagnetic force

  4. Gravitational force

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Correct Option: D
Explanation:

D.  Gravitational Force

Earth's atmosphere is the layer of gases around the Earth. The atmosphere is held in place by Earth's gravity. It is made up of nitrogen (78.1%) and oxygen (20.9%), with small amounts of argon (0.9%), carbon dioxide (0.035%), water vapor, and other gases. The atmosphere protects life on Earth by absorbing (taking) ultraviolet rays from the sun. It makes our days cooler and our nights warmer.

Solid particulates, including ash, dust, volcanic ash, etc. are small parts of atmosphere. They are important in making clouds and fog.

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.