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

Which of the following statements is/are false?

a. The intensity of an earthquake is expressed on the Richter scale. b. The place inside the earth's crust where the earthquake is generated is called the focus of the earthquake. c. The earthquakes having magnitude lesser than 5 are really destructive earthquakes.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

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

This is the correct option as this statement is false. The earthquakes having magnitude greater than 7 are really destructive earthquakes.

Multiple choice

Which of the following statements is/are correct?

a. The sedimentary rocks, which were accumulated in the geosyncline known as the Tethys, were folded to form the mountain system of western Asia and Himalayas. b. The Himalayan uplift out of the Tethys sea and subsidence of the northern flank of the peninsular plateau resulted in the formation of the large basin that became the northern plains. c. Geologically, the peninsular plateau of the Indian subcontinent is supposed to be one of the most stable land blocks.

  1. a only

  2. b only

  3. c only

  4. a and c

  5. a, b and c
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct answer as all the statements are correct.

Multiple choice

The Mid-Atlantic Ridge is an example of

  1. divergent boundary

  2. convergent boundary

  3. spreading boundary

  4. transform boundary
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Mid-Atlantic Ridge is a classic example of a diverent plate boundary where tectonic plates are moving apart. As the plates separate, magma rises to create new oceanic crust, causing seafloor spreading. Convergent boundaries involve plates coming together, transform boundaries involve plates sliding past each other, and 'spreading boundary' is not a standard geological term.

Multiple choice

Consider the following statements regarding earthquakes:

  1. In earthquakes, shocks are generated at a point known as the epicentre.
  2. The points of origin of the shocks may be within the crust or the mantle.
  3. The margins of tectonic plates are more earthquake-prone areas.

Which of the above statements are correct?

  1. 1, 2 and 3

  2. 1 and 2 only

  3. 1 and 3 only

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

Statement 1 is incorrect because shocks originate at the hypocenter (focus), not the epicenter. The epicenter is the point on the surface directly above the hypocenter. Statement 2 is correct - earthquake foci can be in the crust or upper mantle. Statement 3 is correct - plate margins are indeed more earthquake-prone.

Multiple choice

Which of the following statements are true?

  1. Moderate earthquakes are caused along constructive plate boundaries.
  2. Low magnitude earthquakes are caused along constructive plate boundaries.
  3. Disastrous earthquakes are caused along destructive plate boundaries.
  4. Severe earthquakes are caused along the conservative plate boundaries with the creation of transform faults.

  1. 1 and 2

  2. 1 and 3

  3. 1, 3 and 4

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

Statement 1 is correct - moderate earthquakes do occur along constructive plate boundaries. Statement 3 is correct - disastrous earthquakes are typically caused along destructive (convergent) plate boundaries. Statements 2 and 4 are incorrect as they don't accurately describe the relationship between plate boundary types and earthquake severity.

Multiple choice

When the magma in the mantle reaches the ____, it is called lava.

  1. core

  2. inner portion of earth

  3. crust

  4. mantle

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

Magma is called lava when it reaches the Earth's surface (crust). Magma is the molten rock beneath the surface, while lava is the same material once it erupts and flows on the surface. The core and inner portion are too deep, and mantle is where magma originates.

Multiple choice

Which of the following statements is not correct regarding earthquakes?

  1. S waves move objects at right angles to their direction of motion.

  2. S waves propagate through liquids.

  3. As the P waves propagate, they move material in a path parallel to the direction of movement.

  4. L waves travel along the surface of the earth's crust.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

S waves (shear waves) can only travel through solid materials and are absorbed by liquids. The statement 'S waves propagate through liquids' is therefore false. P waves (primary waves) can travel through both solids and liquids, moving material parallel to their direction. L waves (surface waves) travel along Earth's surface.

Multiple choice

The first point on the earth to experience an earthquake wave is

  1. hypocentre

  2. epicentre

  3. focus

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

The epicentre is the point on Earth's surface directly above the focus (hypocentre), which is the actual location inside Earth where the earthquake originates. The epicentre is therefore the first point on the surface to experience earthquake waves, not the focus/hypocentre which is underground.

Multiple choice

Earthquakes along the Himalayas and its foothills are best explained in terms of

  1. divergence of plates

  2. young age of the Himalayas

  3. fragile and largely unconsolidated rocks

  4. plate tectonics
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Frequent earthquakes along the Himalayas and its foothills are caused by the ongoing tectonic collision between the Indian Plate and the Eurasian Plate, which falls under the framework of plate tectonics.

Multiple choice

Which of the following statements are correct?

I. In earthquakes, shocks are generated at a point known as the epicentre. II. The point of origin of shock may be within the crust or mantle. III. Most earthquake-prone areas are at the margins of tectonic plates.

  1. I and III

  2. I and II

  3. II and III

  4. I, II and III
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The point of origin of shock may be within the crust or mantle, and most earthquake-prone areas are at the margins of tectonic plates. There are two main causes of earthquakes. Also, statement I is not correct. The point where earthquake shocks are generated is called its "Focus". The point directly above the "Focus" on the earth's surface is its "Epicentre".

  

Multiple choice

Which of the following is a major tectonic plate?

  1. Philippine Plate

  2. Arabian Plate

  3. Cocos Plate

  4. India-Australia-New Zealand Plate
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The India-Australia-New Zealand Plate (also called the Indo-Australian Plate) is one of the major tectonic plates covering approximately 0.2% of Earth's surface. The Philippine Plate, Arabian Plate, and Cocos Plate are smaller, minor plates. Major plates include: Pacific, North American, South American, Eurasian, African, Indo-Australian, and Antarctic plates.

Multiple choice

Which of the following options is part of the lithosphere?

  1. Crust and lower mantle

  2. Core and crust

  3. Upper core and mantle

  4. Crust and top mantle
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The lithosphere is Earth's rigid outer layer consisting of the crust and the uppermost solid mantle (approximately 100 km thick). It is broken into tectonic plates. The asthenosphere below it is the ductile part of the mantle. Options A, B, and C are incorrect because they include the lower mantle, core, or combinations that don't constitute the lithosphere.