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Q114 (NDA-II/2025) Geography › World Physical Geography › Plate tectonics theory Answer Verified

Which of the following statements is/are correct ? 1. Oceanic trenches are very significant in the study of plate movements 2. Oceanic trenches are associated with active volcanoes and strong earthquakes Select the answer using the code given below :

Result
Your answer: —  Â·  Correct: C
Explanation

Oceanic trenches are critical features in plate tectonics, marking the locations where oceanic lithosphere is subducted into the mantle [4]. Statement 1 is correct because trenches are fundamental indicators of convergent plate boundaries, providing essential evidence for the study of plate movements and the recycling of the Earth's crust [5]. Statement 2 is also correct as trenches are formed during ocean-ocean or ocean-continent convergence, where the subducting plate generates intense friction and pressure [4]. This process results in the world's largest and most destructive earthquakes, as well as the formation of explosive volcanic arcs or island chains parallel to the trench [5]. For instance, the Peru-Chile trench and the Mariana Trench are classic examples where subduction leads to significant seismic and volcanic activity [5].

Sources

  1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 8: Convergent Boundary > 8.2. Continent-Ocean (C-O) Convergence or The Cordilleran Convergence > p. 116
  2. [4] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 12: Water (Oceans) > Oceanic Deeps or Trenches > p. 102
  3. [5] https://pubs.usgs.gov/gip/dynamic/understanding.html
  4. [3] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 31: Ocean Relief > Oceanic Deeps or Trenches > p. 482
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SIMILAR QUESTIONS

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CDS-I · 2014 · Q93 Relevance score: -0.76

Which of the following statements relating to earthquakes is/are correct? 1. The point of origin of an earthquake is called the epicenter. 2. The lines joining the places which were affected by earthquake at the same point of time are called homoseismal lines. Select the correct answer using the code given below.

CDS-II · 2016 · Q14 Relevance score: -0.83

With reference to earthquakes, which of the following statements are correct? 1. Earthquakes largely occur along the converging plate boundaries. 2. Point of origin of earthquake in lithosphere is known as focus/ hypocentre. 3. Intensity of earthquake decreases with distance from the epicentre. 4. Epicentre of earthquake always remains over continents only. Select the correct answer using the code given below.