Tag: components of earth

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

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

  1. Ellipse

  2. Geoid

  3. Globe

  4. Sphere
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Because the Earth rotates, it bulges at the equator and is flattened at the poles. The term 'geoid' describes this specific shape, which represents the Earth's gravitational equipotential surface.

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

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

  1. Crust

  2. Mantle

  3. Outer core

  4. Inner core
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

Which of the following statement is correct?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice components of earth geography inside our earth the earth's structure structure of the earth our world earth and structure

 Mohorovicic discontinuity is the boundary between ________ and _________.

  1. crust and core

  2. mantle and core

  3. crust and mantle

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.


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

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

  1. magma

  2. lithosphere

  3. mantle

  4. asthenosphere
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. lower

  2. upper

  3. middle

  4. side
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. The Inner Core

  2. The Crust

  3. The Outer Core

  4. The Mantle
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. continuity

  2. discontinuity

  3. mental

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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."