Geography ยท Environmental Studies
Oceanography and Hydrology
1,673 Questions
Find relevant questions on oceanography and hydrology that address aquatic ecosystems and physical geography. The topics include coastal landforms, coral reefs, ocean salinity, and tidal patterns. These concepts frequently appear in civil services and state level administrative examinations.
Coral reef structuresCoastal landformsOcean salinity patternsGlacial retreat impactsMangrove ecosystems
Oceanography and Hydrology Questions
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aquifers
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coral reefs
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quagmires
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sea floor vents
A
Correct answer
Explanation
Aquifers are underground layers of water-bearing permeable rock, gravel, sand, or silt from which groundwater can be extracted.
C
Correct answer
Explanation
Approximately 97 percent of Earth's water is found in the oceans as salt water. The remaining 3 percent is fresh water, much of which is locked in ice caps and glaciers.
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chain of islands
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land mass with water on three sides
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elevated plain
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glacial valley filled with seawater
A
Correct answer
Explanation
An archipelago is a group or chain of islands, such as the islands of Japan or the Philippines.
A
Correct answer
Explanation
Desalination is the process of removing salt and other minerals from saline water, such as seawater, to make it suitable for human consumption or irrigation.
A
Correct answer
Explanation
The word 'Sahel' comes from the Arabic word 'sahil', which means 'shore' or 'coast', referring to the edge of the Sahara Desert.
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Barrier reef
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Fringing reef
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Atolls
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None of these
D
Correct answer
Explanation
Barrier reefs, fringing reefs, and atolls are all recognized types of coral reefs. Therefore, none of the options listed are incorrect types.
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Barrier reef
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Fringing reef
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Atolls
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None of these
B
Correct answer
Explanation
Petroleum is primarily formed from the remains of microscopic marine organisms like plankton and algae, not land plants (which are more associated with coal formation).
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in water
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on land
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underground
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in clouds
C
Correct answer
Explanation
Oil deposits are found trapped in porous rock formations deep underground, both on land and beneath the ocean floor.
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petrol
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petroleum
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carbonization
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coal tartaric
B
Correct answer
Explanation
Petroleum was formed from the remains of tiny marine organisms that died and were buried under layers of sediment on the ocean floor millions of years ago.
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covers up so much of Earth's surface
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some upwellings bring nutrients from bottom to the surface
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largest biodiversity
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both a and b
D
Correct answer
Explanation
The open sea covers a vast majority of the Earth's surface, and while its productivity per unit area is low, its sheer size makes it a significant contributor to global net primary productivity (NPP). Upwellings also play a role in nutrient cycling.
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top is where most resources are found
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top layer is largest in size
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top layer isn't the most populated
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top layer is where all marine animals mate
A
Correct answer
Explanation
The top layer of the ocean, known as the euphotic zone, receives sunlight, which is essential for photosynthesis by phytoplankton, forming the base of the marine food web.
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abyssal
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euphotic
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bathyl
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none of the above
B
Correct answer
Explanation
The euphotic zone is the upper layer of the ocean where sunlight penetrates, allowing for photosynthesis, which produces oxygen and supports phytoplankton.
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ther's a higher abundance of food available
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it is not bathal organisms that migrate, it's euphotic
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To ensure they don't use all the food in their zone
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both A and C
D
Correct answer
Explanation
Benthic organisms migrate to surface waters primarily because food is more abundant there, and to avoid depleting resources in their own zone. This vertical migration helps maintain ecological balance across ocean zones.