Geography Topics
Undergraduate level — Geography
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Earth Basics
Maps, Latitude & Longitude
Geomorphology
Climatology
Oceanography
Biogeography
Human Geography
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Advanced Theories and Models
Physical Geography
Indian Geography
World Geography
Geography of Bihar
Climate & Environment
quiz Questions
Q121
In Charles Darwin’s theory of coral reef evolution, what is the sequence of reef structures produced by a sinking volcanic island over geologic timescales?
Atoll $\rightarrow$ Barrier reef $\rightarrow$ Fringing reef
Fringing reef $\rightarrow$ Barrier reef $\rightarrow$ Atoll
Barrier reef $\rightarrow$ Fringing reef $\rightarrow$ Atoll
Fringing reef $\rightarrow$ Atoll $\rightarrow$ Barrier reef
Explanation
Darwin's model states that coral reefs progress from fringing reefs attached to the island, to barrier reefs separated by a lagoon as the island sinks, and finally to circular rings called atolls.
Q122
What terminology defines a coastal configuration where a river valley has been partially drowned by a post-glacial eustatic sea-level rise, forming an elongated, branching estuary?
Fjord coast
Ria coast
Dalmatian coast
Haff coast
Explanation
A ria is a submerged coastal river valley formed by rising sea levels. Fjords are submerged glaciated valleys, while dalmatian coasts feature submerged parallel mountain ridges.
Q123
Which force balances the gravitational pull of the Earth in the generation of ocean tides, acting away from the center of mass of the Earth-Moon orbital system?
Coriolis deflection
Centrifugal force from barycentric rotation
Magnetic field induction
Hydrostatic pressure vectors
Explanation
The tidal bulges are formed by the balance between the moon's localized gravitational tractive force and the centrifugal force generated by the barycentric rotation of the Earth-Moon system.
Q124
What structural feature refers to the deep, flat floor of the open ocean, typically situated at depths between 3,000 and 6,000 meters and covered in fine-grained pelagic clays?
Continental rise
Abyssal plain
Submarine trench wall
Mid-ocean ridge crest
Explanation
The abyssal plains are vast, flat areas of the deep ocean floor that cover a significant portion of the marine basin.
Q125
Which type of micro-algae forms the structural basis of biogenous siliceous oozes in cold, high-latitude upwelling zones, utilizing silica to build their glass-like cell walls?
Foraminifera
Diatoms
Coccolithophores
Pteropods
Explanation
Diatoms are single-celled, photosynthetic algae with silica skeletons (frustules) that thrive in cold, nutrient-rich high-latitude surface waters, forming diatomaceous oozes upon settling.
Q126
What type of tide occurs when the Moon, Earth, and Sun are aligned in a straight line (syzygy), causing the gravitational forces to reinforce each other and produce the maximum tidal range?
Neap tide
Spring tide
Diurnal tide
Apogean tide
Explanation
Spring tides occur during new and full moons when the Sun and Moon line up with Earth, maximizing the combined gravitational tractive force.
Q127
Which ocean current forms the north-flowing eastern boundary current of the South Pacific Gyre, associated with intense coastal upwelling and the world's richest fisheries?
Kuroshio Current
Peru Current
California Current
East Australian Current
Explanation
The Peru (or Humboldt) Current flows northward along western South America, driven by trade winds that induce powerful coastal upwelling of cold, nutrient-dense waters.
Q128
What physical parameter states that the relative proportions of major dissolved ions in open-ocean seawater remain remarkably constant, regardless of total salinity variations?
Archimedes stability criteria
Forchhammer's Principle of Constant Proportions
Van 't Hoff's osmotic law
Henry's gas saturation rule
Explanation
The Principle of Constant Proportions (Forchhammer's Principle) states that although absolute salinity varies, the ratio of major ions (like sodium, chloride, magnesium) remains fixed due to thorough mixing.
Q129
Which type of sub-marine feature consists of an elongated, V-shaped depression scoured into the continental slope by historical turbidity currents, acting as pathways for sediment transport?
Abyssal hill complex
Submarine canyon
Guyot alignment
Aulacogen graben
Explanation
Submarine canyons are steep-sided valleys cut into the continental slope, often extending across the shelf, eroded by underwater sediment avalanches.
Q130
What oceanographic feature is a closed, rotating body of water that splits off from a major boundary current, containing a cold-water core enclosed by warm gyre water streams?
Warm-core ring
Cold-core ring
Equatorial counter-eddy
Upwelling plume
Explanation
Cold-core rings are cyclonic eddies that pinch off from currents like the Gulf Stream, trapping cold slope water inside a ring of warm water moving counterclockwise in the Northern Hemisphere.