Tag: components of earth

Questions Related to components of earth

The Sial layer is formed of _____ and ______.

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

  1. silica and argon

  2. silica and aluminium

  3. scandium and argon

  4. sulfur and argon

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Correct Option: B
Explanation:

Sial refers to the earth’s crusts upper layer, it is made up of rocks abundant in silicate and aluminium-based minerals. The word Sial itself is an amalgam of the first two letters of aluminium and silica, Sial runs anywhere from 5-70KM deep from the surface.

The layer just below the crust is called the ________.

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. mantle

  4. core

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Correct Option: C
Explanation:

The layer just below the crust is called the mantle. This layer is the layer of basalt rock which is heavier than the topmost layer. The density of this layer varies from 3.1 to 5.00. The average thickness of this layer is 100 to 2900 km. Silica and magnesium elements predominate and it is popularly known as SIMA.

The average thickness of the crust is _____ km below the continent and _____ km below the ocean.

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

  1. 35 , 6

  2. 10 , 50

  3. 80, 60

  4. 30, 90

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Correct Option: A
Explanation:

The average thickness of the crust is 35 km below continents, 6 km below oceans (plus 5 km of sea water). 

Generally the warm ocean currents originate near the ___________.

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

  1. poles

  2. equator

  3. tropics

  4. temperate zone

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Correct Option: B
Explanation:

The equatorial region is hot and light and polar regions are cold and heavy. So warm ocean current originate near the equator and flow towards the polar region.

The outer most layer of the earth which is formed of solid rocks is called the ___________.

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

  1. soil

  2. crust

  3. core

  4. Sial

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Correct Option: B
Explanation:

The outer most or top most layer of the earth is termed as crust. The crust of the earth is consist of sedimentary and granite rocks. The average density of crust is 2.8 to 3. The outer layer of the earth mainly found under continent. 

The thinnest layer 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. Crust

  2. Mantle

  3. Core

  4. None of these

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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 thickness of the mantle is about _____________.

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

  1. 2900 km

  2. 2500 km

  3. 2600 km

  4. 2800 km

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Correct Option: A
Explanation:

The mantle is the mostly-solid bulk of Earth's interior. The mantle lies between Earth's dense, super-heated core and its thin outer layer, the crust. The mantle is about 2,900 kilometers (1,802 miles) thick and makes up a whopping 84% of Earth's total volume.

The innermost layer 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. Crust

  2. Core

  3. Mantle

  4. None of these

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Correct Option: B
Explanation:

Earth's inner core is the innermost geologic layer of the Earth. It is primarily a solid ball with a radius of about 1,220 kilometres (760 miles), which is about 20% of the Earth's radius or 70% of the Moon's radius.

Continental crust can be up to ______ kilometers thick.

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

  1. 35

  2. 5

  3. 100

  4. 65

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Correct Option: A
Explanation:

Global observations show that the crustal thickness varies through the tectonic regions. While the continental crust is 30–70 km thick, the oceanic crustal thickness is 6–12 km. 

Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?

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

  1. Silicon

  2. Oxygen

  3. Carbon

  4. Calcium

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Correct Option: B
Explanation:

Oxygen is by far the most abundant element in the earth's crust. Scientists estimate oxygen comprises nearly half of the mass of the crust. It also accounts for 21 percent of Earth's atmosphere