Oceans & Currents — Set 2
Geography · महासागर और धाराएं · Questions 11–20 of 50
Which current circles the entire globe in the Southern Hemisphere uninterrupted by land?
Correct Answer: A. West Wind Drift
The West Wind Drift, also known as the Antarctic Circumpolar Current, circles the globe uninterrupted. It flows from west to east around Antarctica. It connects the Atlantic, Pacific, and Indian Oceans.
The climatic phenomenon where warm water replaces cold water off the coast of Peru is called?
Correct Answer: B. El Nino
El Nino is the phenomenon where warm ocean water replaces the usual cold nutrient-rich water off the coast of Peru. This disrupts local fisheries and affects global weather patterns. It usually occurs around Christmas time.
Which of the following is a cold current flowing near Japan?
Correct Answer: B. Oyashio Current
The Oyashio Current (or Kurile Current) is a cold current flowing south from the Bering Sea towards Japan. It collides with the warm Kuroshio Current. This convergence is rich in marine life.
Which ocean relief feature connects the Continental Shelf to the Continental Rise?
Correct Answer: B. Continental Slope
The Continental Slope connects the Continental Shelf to the Continental Rise. It has a steep gradient compared to the shelf. It marks the true edge of the continent.
What is the average salinity of the world's oceans?
Correct Answer: A. 35 parts per thousand
The average salinity of the world's oceans is approximately 35 parts per thousand (ppt). This means there are about 35 grams of salt in every kilogram of seawater. Salinity varies slightly depending on evaporation and freshwater influx.
Which current flows north along the west coast of Southern Africa?
Correct Answer: D. Benguela Current
The Benguela Current flows north along the west coast of Southern Africa. It is a cold water current that contributes to the aridity of the Namib Desert. It forms the eastern limb of the South Atlantic Gyre.
The Puerto Rico Trench is the deepest point in which ocean?
Correct Answer: B. Atlantic Ocean
The Puerto Rico Trench is the deepest part of the Atlantic Ocean. It is located on the boundary between the Caribbean Sea and the Atlantic Ocean. Its maximum depth is over 8,000 meters.
The Kuroshio Current in the Pacific Ocean is the equivalent of which current in the Atlantic?
Correct Answer: A. Gulf Stream
The Kuroshio Current is the Pacific equivalent of the Gulf Stream in the Atlantic. Both are warm, western boundary currents that transport heat poleward. 'Kuroshio' means 'Black Stream' in Japanese.
Extensive flat areas on the ocean floor are known as?
Correct Answer: B. Abyssal Plains
Abyssal Plains are vast, flat areas on the deep ocean floor. They are covered with fine-grained sediments like clay and silt. They are considered the flattest and smoothest regions on Earth.
Which ocean current reverses its direction with the change of seasons?
Correct Answer: D. Somali Current
The Somali Current in the Indian Ocean reverses its direction seasonally. This reversal is driven by the changing monsoon winds. It flows southwest during winter and northeast during summer.