Oceans and Currents

5 min

Master major ocean currents, salinity, tides and coral reefs for competitive exams

Warm ocean currents originate near the equator and flow towards the poles, while cold currents flow from poles to the equator.

Direct questions on naming warm and cold currents like Gulf Stream or Labrador.
Fishing grounds form where warm and cold currents meet, vital for static GK.
Salinity, tides and coral reef locations appear frequently in UPSC, SSC and Defence.

Memory Shortcuts

Spring Tide

(Highest Tidal Range)

Highest Tidal Range

Occurs on full moon and new moon days.

Neap Tide

(Lowest Tidal Range)

Lowest Tidal Range

Occurs during moon's first and third quarters.

Coral Reef

(Polyps & Zooxanthellae)

Polyps & Zooxanthellae

Thrives in warm, shallow tropical waters.

Salinity

(Dissolved Salt)

Dissolved Salt

Measured in parts per thousand (ppt).

Peruvian current is warmPeruvian (Humboldt) is cold

Humboldt current along South America is a cold current, often confused as warm due to low latitude.

Tides caused only by SunCaused by Sun and Moon gravity

Moon has greater gravitational pull on Earth's tides than the Sun because it is much closer.

Coral reefs grow in deep cold seaGrow in shallow warm tropical water

Corals require sunlight and warm water above 20°C, so they never grow in deep dark trenches.

Q1.Which of the following is a cold ocean current?

Q2.Spring tides occur when:

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