Oceanic Trenches

1. Which one of the following is not a bottom relief of the Indian Ocean?

Which one of the following is not a bottom relief of the Indian Ocean?

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Chagos Ridge
Amsterdam-St. Paul Ridge
Somali Basin
Philippine Trench
This question was previously asked in
UPSC CBI DSP LDCE – 2023
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The Philippine Trench is a major feature of the Pacific Ocean floor, not the Indian Ocean.
The Chagos Ridge is a submarine ridge system located in the central Indian Ocean. The Amsterdam-St. Paul Ridge is part of the Southeast Indian Ridge, a divergent plate boundary in the Indian Ocean. The Somali Basin is a significant abyssal plain located in the western Indian Ocean, off the coast of Somalia. The Philippine Trench, also known as the Mindanao Trench, is a trench located in the western North Pacific Ocean, east of the Philippines.
The Indian Ocean floor features various ridges, basins, plateaus, and trenches, including the Ninety East Ridge, the Central Indian Ridge, the Mid-Indian Ridge, the Sunda Trench (Java Trench), and several abyssal plains like the Somali Basin and the Central Indian Basin. Trenches are typically found at convergent plate boundaries where one tectonic plate subducts beneath another.

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2. The Mariana trench is the deepest part of the Oceans. Which one among

The Mariana trench is the deepest part of the Oceans. Which one among the following statements regarding this is not correct ?
– It is located in the Western Pacific Ocean, to the West of Mariana island
– The trench was first sounded during the Challenger expedition in 1875
– The trench is about 2550 km long and an average width of only 69 km
– At the bottom of the trench the water column above exerts a pressure over 1000 times the standard atmospheric pressure at sea level

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It is located in the Western Pacific Ocean, to the West of Mariana island
The trench was first sounded during the Challenger expedition in 1875
The trench is about 2550 km long and an average width of only 69 km
At the bottom of the trench the water column above exerts a pressure over 1000 times the standard atmospheric pressure at sea level
This question was previously asked in
UPSC CAPF – 2014
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The incorrect statement is that the Mariana Trench is located to the West of the Mariana Islands.
The Mariana Trench is located in the western Pacific Ocean, but it lies *east and south* of the Mariana Islands. The trench runs roughly north-south/northeast-southwest, with the islands located to its west.
– The Challenger expedition did indeed make the first recorded sounding of the trench in 1875.
– The dimensions of the trench are approximately 2550 km (1,580 miles) long and 69 km (43 miles) wide, making statement C correct.
– The maximum depth of the Challenger Deep in the Mariana Trench is over 10,994 meters (~11 km). Hydrostatic pressure increases by approximately 1 atm for every 10 meters of depth. At 11 km, the pressure is about 1100 atm, which is indeed over 1000 times standard atmospheric pressure at sea level, making statement D correct.

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3. Mariana Trench is located in the ocean floor of

Mariana Trench is located in the ocean floor of

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Southern Atlantic Ocean
Western Pacific Ocean
Eastern Pacific Ocean
Northern Atlantic Ocean
This question was previously asked in
UPSC NDA-2 – 2017
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The Mariana Trench is located in the western Pacific Ocean, east of the Mariana Islands. It is the deepest known part of the world’s oceans.
The Mariana Trench is the deepest oceanic trench on Earth, situated in the western Pacific Ocean.
The deepest point within the trench is known as the Challenger Deep. Oceanic trenches are characteristic features of convergent plate boundaries, where one tectonic plate is subducting beneath another.

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4. Which one of the following is considered as the deepest point of the

Which one of the following is considered as the deepest point of the oceans?

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Tonga Trench
Mariana Trench
Philippine Trench
Kermadec Trench
This question was previously asked in
UPSC CDS-2 – 2020
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The Mariana Trench, located in the western Pacific Ocean, is the deepest part of the world’s oceans. Its deepest point, known as the Challenger Deep, reaches a depth of about 10,984 meters (36,037 feet).
– The Mariana Trench is the deepest oceanic trench on Earth.
– The Challenger Deep within the Mariana Trench is the absolute deepest point.
The Tonga Trench is the second deepest trench, and the Philippine Trench and Kermadec Trench are also very deep trenches located in the Pacific Ocean, but none are as deep as the Mariana Trench. Oceanic trenches are formed by the subduction of one tectonic plate under another.

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