Geography · General Awareness

Geology and Earth Structure

1,345 Questions

Geology and Earth Structure explores the physical composition of the planet, including its layers, tectonic plates, and seismic activity. This topic is a core component of geography and general science sections in various competitive exams. Reviewing these concepts builds a solid foundation for answering questions related to natural phenomena.

Layers of the EarthTectonic PlatesEarthquakes and VolcanoesGeomagnetism ApplicationsGeophysical MethodsLandform Formation

Geology and Earth Structure Questions

Multiple choice

The Himalayas are formed due to

  1. internal pressure of two large land forms

  2. faulting of the earth's crust

  3. folding of the earth's crust

  4. folding of the geo-syncline named Tethys
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The Himalayas were formed from the Tethys geosyncline, which was a vast sedimentary basin between the Indian and Eurasian plates. When these plates collided approximately 50 million years ago, the sediments in the Tethys Sea were folded and uplifted to create the magnificent Himalayan mountain range we see today.

Multiple choice

Which of the following is not a correct explanation for the mantle?

  1. It extends to a depth of 2800 km below the crust.

  2. It is the central region between the core and the crust.

  3. The pressure inside it increases according to the depth.

  4. Its outer layer is of molten iron and nickel.

  5. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 This statement is not about the mantle. It describes the outer core of the innermost part of the earth.

Multiple choice

Which of the following is the correct explanation for a tsunami?

  1. It occurs along the edges of the tectonic plates.

  2. It is caused by earthquakes or volcanic activity occurring under the ocean.

  3. It is the tremor that produces waves on the surface of the earth.

  4. It is the vertical distance between the hypocentre and the epicentre.

  5. It generates seismic waves.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A tsunami is caused by earthquakes or volcanic activity occurring under the ocean.

Multiple choice

The outer core is composed mainly of ______ while the inner core is almost entirely composed of iron.

  1. aluminium-zinc

  2. nickel-iron alloy

  3. manganese-nickel

  4. chromium-molybdenum
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Earth's outer core is primarily composed of iron and nickel in liquid state, while the inner core is solid and almost entirely iron with some nickel. The other options (aluminium-zinc, manganese-nickel, chromium-molybdenum) are not major components of Earth's core structure.

Multiple choice

Waves of earthquake are recorded in _____.

  1. barograph

  2. hydrograph

  3. seismograph

  4. demograph

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A seismograph is the instrument that records seismic waves produced by earthquakes. A barograph records atmospheric pressure, a hydrograph records water level/flow, and demograph is not a standard instrument.

Multiple choice

Which of the following valleys formed as a result of tectonic forces?

  1. 'V' - shaped valley

  2. 'Z' - shaped valley

  3. Rift valley

  4. Extended Valley

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A rift valley is formed when tectonic plates move apart, creating a depression between them. V-shaped valleys are formed by river erosion. Z-shaped and Extended Valley are not standard geographical terms for valley formation types.

Multiple choice

Consider the following statements (1) Plate Tectonics reveals not only the motion of continents but also of oceans. (2)The cause of these motions is the earth being composed of several rigid segments, called plates. (3)The various plate movements are called constructive, destructive and conservative plate movements. Which of the above statements is / are correct?

  1. 1 only

  2. 1 and 3

  3. 1 and 2

  4. 1, 2 and 3
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

All three statements about Plate Tectonics are correct. The theory explains the motion of both continents and oceanic plates (1), the Earth's lithosphere is divided into several rigid plates (2), and plate boundaries are classified as constructive (divergent), destructive (convergent), and conservative (transform) based on their relative motion (3).

Multiple choice

Most of the devastating earthquakes are usually caused by

  1. eustatic movement

  2. isostatic adjustment

  3. collision of earth's plates

  4. volcanic eruption
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Most devastating earthquakes are caused by the collision of tectonic plates. When plates collide, enormous stress builds up and is suddenly released as seismic energy. This process at convergent plate boundaries has produced some of the largest earthquakes in history, including the 2004 Sumatra earthquake. Eustatic movement and isostatic adjustment are gradual processes, while volcanic eruptions cause local tremors but rarely produce the most devastating quakes.

Multiple choice

What is continental shelf?

  1. Mountain ranges the edge a continent.

  2. The raised land on a continent's edge.

  3. The land that gently slopes and extension of the continents before sharply sloping to form the sea floor in the deeps.

  4. A plateau at the centre of a continent.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The continental shelf is the gently sloping underwater extension of continents, typically extending to depths of 200-300 meters before dropping steeply to the ocean floor. This zone is biologically productive and rich in mineral resources.

Multiple choice

Earthquake waves are recorded in

  1. barograph

  2. hydrograph

  3. seismograph

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

A seismograph is the scientific instrument specifically designed to detect, record, and measure earthquake waves (seismic waves). Barograph records atmospheric pressure, hydrograph records water flow, and pantagraph is a mechanical copying device.

Multiple choice

Which of the following is measured on the Richter scale?

  1. Density of liquids

  2. Magnitude of earthquakes

  3. Velocity of tornadoes

  4. Height of mountains
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Richter scale measures the magnitude of earthquake energy release. It does not measure liquid density, tornado velocity (Fujita scale), or mountain height.

Multiple choice

The magnitude of an earthquake is expressed on

  1. decibel scale

  2. richter scale

  3. celsius scale

  4. kelvin scale

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This is the correct option. The magnitude of an earthquake is expressed on the richter scale.

Multiple choice

Which of the following statements is/are false?

a. An earthquake is a sudden shaking of Earth which lasts for a very short time that occurs when the moving plates of the Earth's crust slide past or collide with one another. b. The inside of the Earth's crust is made up of the core, mantle and crust. c. An earthquake is a destructive natural phenomenon that can be predicted in advance.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as the statement is false. An earthquake is a destructive natural phenomenon that cannot be predicted in advance.