What is the deepest sea (not ocean) in the world?
Caribbean Sea
Mediterranean Sea
South China Sea
Caribbean Sea
The Caribbean Sea reaches depths of 7,686 meters (25,217 feet) in the Cayman Trough, making it the deepest sea.
How deep is the average depth of the Pacific Ocean?
4,000 meters
4,280 meters
4,188 meters
4,380 meters
The Pacific Ocean’s average depth is 4,188 meters (13,740 feet), making it the deepest ocean on average.
Which submersible made the first crewed descent to Challenger Deep in 1960?
Trieste
Nautilus
Alvin
Deepsea Challenger
The Trieste, piloted by Jacques Piccard and Don Walsh, reached the bottom on January 23, 1960, spending 20 minutes there.
What is the second deepest ocean trench in the world?
Tonga Trench
Philippine Trench
Puerto Rico Trench
Japan Trench
The Tonga Trench reaches a depth of 10,882 meters (35,702 feet), just slightly shallower than the Mariana Trench.
How many known trenches in the Pacific Ocean are deeper than 6,000 meters?
27
32
35
30
The Pacific Ocean contains 32 deep trenches exceeding 6,000 meters, making it home to the majority of Earth’s deepest points.
What is the deepest point in the Atlantic Ocean?
Puerto Rico Trench
South Sandwich Trench
Milwaukee Deep
Romanche Trench
Milwaukee Deep in the Puerto Rico Trench reaches 8,376 meters (27,480 feet), the deepest point in the Atlantic Ocean.
In what year did James Cameron make his solo descent to Challenger Deep?
2010
2011
2012
2013
On March 26, 2012, James Cameron became the first person to make a solo descent to Challenger Deep in the Deepsea Challenger.
What is the deepest known point on Earth, located in the Mariana Trench?
Challenger Deep
Tonga Deep
Philippine Deep
Java Deep
Challenger Deep reaches a depth of 10,911 meters (35,797 feet), discovered in 1951 by the HMS Challenger II expedition.
What pressure exists at the bottom of Challenger Deep?
1,086 atmospheres
1,125 atmospheres
1,086 atmospheres
1,155 atmospheres
The pressure at Challenger Deep is approximately 1,086 atmospheres, or 15,750 psi, enough to crush most submarines.
Which ocean contains the Java Trench, with a depth of 7,725 meters?
Pacific Ocean
Indian Ocean
Atlantic Ocean
Southern Ocean
The Java Trench is located in the Indian Ocean, representing its deepest point and formed by the subduction of the Australian Plate.
What was the first remotely operated vehicle (ROV) to reach Challenger Deep?
Kaiko
Jason
REMUS
Nereus
Japan’s Kaiko ROV reached Challenger Deep in 1995, becoming the first unmanned vehicle to explore its depths.
How deep is the Mediterranean Sea at its deepest point?
5,267 meters
5,121 meters
4,982 meters
5,267 meters
The Calypso Deep in the Ionian Sea reaches 5,267 meters (17,280 feet), marking the Mediterranean’s deepest point.
Which deep-sea zone begins at 1,000 meters depth?
Bathyal Zone
Abyssal Zone
Mesopelagic Zone
Bathypelagic Zone
The Bathypelagic Zone, also known as the midnight zone, extends from 1,000 to 4,000 meters depth where no sunlight penetrates.
What percentage of the ocean floor has been mapped in high resolution as of 2023?
0.2
0.24
0.28
0.32
Only about 24% of the ocean floor has been mapped in high resolution, leaving vast areas still unexplored.
How deep is the Arctic Ocean at its deepest point?
5,450 meters
5,550 meters
5,650 meters
5,750 meters
The Fram Strait reaches 5,550 meters (18,210 feet), marking the deepest point in the Arctic Ocean.
What is the average depth of the world’s oceans?
3,688 meters
3,788 meters
3,888 meters
3,988 meters
The average depth of all oceans combined is 3,788 meters (12,430 feet), with significant variations between regions.
Which year did Victor Vescovo complete dives to all five ocean’s deepest points?
2018
2019
2020
2021
Victor Vescovo completed the Five Deeps Expedition in 2019, becoming the first person to visit the deepest points of all five oceans.
How many known species live below 200 meters in the ocean?
17000
20000
23000
26000
Approximately 17,000 species are known to live in the deep ocean, with many more believed to be undiscovered.
What is the depth of the Diamantina Deep in the Indian Ocean?
8,047 meters
8,147 meters
8,247 meters
8,347 meters
The Diamantina Deep reaches 8,047 meters (26,401 feet), making it one of the Indian Ocean’s most significant deep points.
How many submarine canyons deeper than 1,000 meters exist worldwide?
9090
9190
9290
9390
There are approximately 9,190 submarine canyons deeper than 1,000 meters, forming crucial deep-sea ecosystems.
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