Tag: earth and structure

Questions Related to earth and structure

Which one of the following statements is not correct about the core of the earth?

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

  1. It is made up of light minerals

  2. It is made up of hot and molten rocks

  3. Its estimated temperature is about $3300^{\circ}C$

  4. It acts like a solid mass

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Correct Option: A
Explanation:
  • The core of the earth is made up of heavy minerals like iron and nickel hence statement in option A is incorrect which makes it the right answer.
  • Rest statements are true 
  • The outer core is made up of molten rocks, its estimated temperature is 3300 degrees C and the inner core acts like a solid mass.
  • Note- inner core is solid and the outer core is liquid.

The highest and most extensive mountains are _________.

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

  1. fold mountain

  2. residual mountain

  3. black mountain

  4. none of these

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Correct Option: A
Explanation:

Fold mountains are formed due to the folding of crustal rocks by compressive forces generated by the movements inside the earth. Thus fold mountains can be said to be caused by the influence of internal forces. These are the highest and most extensive mountains of the world and are found in all the continents.

Which of the following phenomena causes the shape of the Earth?

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

  1. Internal structure

  2. Atmospheric pressure

  3. Rotation

  4. Revolution

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Correct Option: C
Explanation:

Earth is slightly bulged out towards the equator due to the spin. If the rotation stops, the shape might not change immediately, but water and atmosphere would go to the poles making it thicker there. Mid way through the equator and poles, the region will have moderate pressure. Gravity makes it spherical. Earth spin then extends it out at the equator and flattens it at the poles.

The upper part of the earth's crust is called SIAL because ___________.

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

  1. It is rich in sodium and aluminium

  2. It is rich in silica and aluminium

  3. It is rich in scandium and arsenic

  4. It is rich in sulphur and argon

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Correct Option: B
Explanation:

The outer or upper layer of the earth's crust is mostly found under the continent. Silica and aluminum are abundantly found in this layer therefore it is popularly known as SIAL. The average density of the layer is 2.75 to 2.90 and the average thickness is 8 to 100 km.

The middle layer of the earth's interior is called _________.

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

  1. Mantle

  2. Core

  3. Crust

  4. Magma

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Correct Option: A
Explanation:

Mental is the middle layer of the earth lies between crust and core. The average thickness of this layer is 100 to 2900 km. Silica and magnesium elements predominate in this layer so it is known as SIMA.  Density of the layer varies between 3.1 to 5.00. It has two layers: upper mantle and lower mantle.  

The lower part of the crust known as 'Oceanic Crust' is rich in __________.

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

  1. Aluminium and copper

  2. Magnesium and aluminium

  3. Copper and gold

  4. Silica and magnesium

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Correct Option: D
Explanation:

Sima is the name for the lower layer of the Earth's crust. This layer is made of rocks rich in magnesium silicate minerals. Typically when the sima comes to the surface it is basalt, so sometimes this layer is called the 'basalt layer' of the crust. The sima layer is also called the basal crust or basal layer because it is the lowest layer of the crust. Because the ocean floors are mainly sima, it is also sometimes called the oceanic crust.

The thinnest layer of the earth is ____________.

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. inner core

  4. outer core

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Correct Option: A
Explanation:

The Earth can be divided into four main layers: the solid crust on the outside, the mantle, the outer core and the inner core. Out of them, the crust is the thinnest layer of the Earth, amounting for less than 1% of our planet's volume

The boundary that separates the mantle from the core is called _________.

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

  1. Gutenberg Discontinuity

  2. Mohorovicic Discontinuity

  3. Core Boundary

  4. All of these

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Correct Option: A

Which is the right sequence of the different layers of the earth's interior?

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

  1. SIAL, SIMA, Asthenosphere, Mesosphere, NIFE

  2. SIMA, SIAL, Asthenosphere, NIFE, Mesosphere

  3. Asthenosphere, Mesosphere, SIAL, SIMA, NIFE

  4. NIFE, SIAL, SIMA, Asthenosphere, Mesosphere

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Correct Option: A

The innermost layer of the earth's interior is called _____________.

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

  1. SIAL

  2. SIMA

  3. NIFE

  4. Core

Show answer
Correct Option: D
Explanation:

The innermost layer of the earth is core. This central mass mainly made of nickel and iron and therefore is known as NIFE. The density of the layer is 5.1 to 13.00. It is composed of heaviest mineral materials. The core contains 1/3 of the entire mass of the earth. It has two layers outer metallic core and inner metallic core.