This topic targets the deepest parts of the ocean floor. It maps prominent trenches (hadal zones) globally, linking their genesis to tectonic subduction zones along convergent plate boundaries.
Match List I with List II and select the correct answer using the code given below in the lists.
List- I List- II
(Oceanic Trench) (Location)
Aleutian 1. Indian Ocean
Kermadec 2. North Pacific
Sunda 3. South pacific
S. Sandwich 4. South Atlantic Ocean
Code :
A B C D
Correct Answer:
(B) 2 3 1 4
Trenches and Deeps found in the Oceans asked in the question are as follows –
Indian Ocean : Sunda Deep and Diamantina Trench.
North Pacific Ocean : Mariana Trench, Kuril Trench, Aleutian Trench and Japan Trench.
South Pacific Ocean : Tonga trench, Kermadec trench, Atacama trench.
North Atlantic Ocean : Puerto - Rico trench.
South Atlantic Ocean : South Sandwich trench.
Therefore, option (b) is the correct answer.
Ques: 2
Match List-I with List-II and select the correct answer from the codes given below:
List-I List-II
(Ocean) (Deepest Point)
Pacific Ocean 1. Java Trench
Atlantic Ocean 2. Eurasian Basin
Indian Ocean 3. Mariana Trench
Arctic Ocean 4. Puerto Rico Trench
Code :
A B C D
Correct Answer:
(B) 3 4 1 2
Pacific Ocean : The Mariana Trench located in the Western Pacific Ocean, east of Mariana Islands is the deepest natural trench in the world.
Atlantic Ocean : The Puerto Rico Trench is located between the Caribbean sea and the Atlantic Ocean. The trench is 800 km. long and 8,376 meters deep making it the deepest point in the Atlantic Ocean.
Indian Ocean : The Java Trench, also known as the Sunda Trench, is located near Sumatra. The trench is considered to be part of Pacific Ring of Fire.
Arctic Ocean : The Eurasian Basin.
Ques: 3
Which is the world's deepest trench?
Correct Answer:
(B) Challenger
The Mariana trench or Challenger trench is located in the Pacific Ocean, east of the Mariana Islands in the shape of a crescent. It has the deepest part of the Earth's Oceans known as Challenger-Deep, named after the British exploration vessel HMS challenger-II.
Ques: 4
In which one of the following oceans Diamantina Trench is situated ?
Correct Answer:
(C) Indian Ocean
Diamantina Trench is in the Indian Ocean. It is located about 1125 km south-west from the Perth Basin. It is also known as Diamantina fracture zone.
Ques: 5
Consider the following statements regarding Ocean trenches?
They occur at the bases of continental slopes associated with active the volcanoes and strong earthquake.
They begin where the bottom of continental shelf sharply drops off into a steep slope.
They are found in the tropical oceans consisting of coral reefs surrounding a central depression.
Which of the statements given above are correct?
Correct Answer:
(A) 1 only
Oceanic deeps or trenches are the deepest parts of the oceans. The trenches are relatively steep sided, narrow basins. They are some 3-5Km deeper than the surrounding ocean floor. They occur at the bases of continental slopes and along island arcs and are associated with active volcanoes and strong earthquakes.
Statement 2 is incorrect: The continental slope connects the continental shelf and the ocean basins. It begins where the bottom of the continental shelf sharply drops off into a steep slope.
Statement 3 is incorrect: Atolls are low islands found in the tropical oceans consisting of coral reefs surrounding a central depression.