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By: GnY
quiz explanation

Here is a quiz that will help you understand the basic terms and processes related to oceanography. Don’t forget to brag about your scores on out Facebook page:-link.

  1. What is the study of ocean’s past known as

C) Paleoceanography

Ans: C. Paleoceanography- It is the scientific study of Earth’s oceanographic history involving analysis of the ocean’s circulation, chemistry, geologic changes and established relationships between present sedimentation patterns and environmental factors

  1. How is water distributed on Earth

D) 5 per cent ocean and 3.5 per cent others

Ans: D. 96.5 per cent of earth’s water is in oceans, 0.9 per cent saline water in land, 2.5 per cent is freshwater (Glaciers and ice caps- 68.7 per cent, Groundwater- 30.1 per cent , Surface and other freshwater-1.2 per cent).

  1. Over fertilization of water bodies due to pesticides and fertilisers run off causes


Ans: B. Eutrophication- It is the aging process of a water body in which excessive nutrients from run-offs causes dense growth of plants and death of animals due to lack of oxygen.

  1. Which of the following is the outcome of warming sea and ocean acidification

B) Coral bleaching

Ans : B. Coral Bleaching- Corals are in symbiotic relationship with algae (Zoonxanthallae) which lives in their tissue. They are the primary source of food and give their appealing colour. When ocean water warms up or any change takes place like light or nutrients the algae is expelled out from their tissue and turns white or pale. This is known as coral bleaching. Ocean acidification also reduces the rate of calcification (related to formation of corals).

  1. Organisms that live on or in the bottom of oceans are known as

C) Benthos

Ans: C. Assemblages of organisms inhabiting the seafloor are known as benthos. Benthic epifauna live upon the seafloor or upon bottom objects while infauna lives within the sediments of the seafloor. E.g. of benthic organisms are Starfish, Oysters, Clam, Sea Cucumber etc.

  1. A lagoon is a

D) An area of sea water separated from ocean by reef or sand bar

Ans: D- An area of sea water separated from the ocean by reef or sand bar.

  1. The deepest point of the Earth’s ocean is

A) Mariana Trench

Ans: A. Mariana Trench- Challenger Deep of the Mariana trench is the deepest known point of the Earth’s ocean. It is ~11 km deep and located in the Pacific Ocean.

  1. What is the apparent curving of the path of oceans and winds due to Earth’s rotation?

B) Coriolis force

Ans: B. Because of the rotation of the Earth circulating ocean or wind is deflected. Instead of circulating in the straight pattern, the air deflects towards the right in the Northern Hemisphere and towards the left in the Southern Hemisphere. This deflection is called as Coriolis force. The coastal current and curving of path of oceans is driven by this phenomenon.

  1. The infamous Pacific trash vortex in the Pacific Ocean is

C) A Gyre of marine debris which consist of pelagic plastics, chemicals and other debris

Ans: C. Pacific trash vortex is also called as the Great Pacific Garbage Patch. It is a collection of ocean debris which mainly consist of micro plastics, chemicals and other debris in the North Pacific Ocean. It concentrates in the particular area between Hawaii and California because of the ocean currents.

  1. Where did the Deepwater Horizon oil spill take place?

A) Gulf of Mexico

Ans:   A. It is also known as Gulf of Mexico oil spill of 2010 which is one of the largest marine oil spill in history. It happened due to explosion of the deepwater horizon oil rig and estimated to have spilled 210 million US gallon of oil.

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