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प्रश्न
Explain the types of ocean currents.
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उत्तर
The factors that generate ocean currents are:
- Earth’s rotation
- Prevailing winds and
- Differences in temperature and salinity of ocean water.
On the basis of temperature, ocean currents are classified as warm currents and cold currents. The movement of ocean currents from the low latitudes (tropical zones) towards high latitudes (temperate and polar zones) is called warm current, e.g. Gulf Stream in Atlantic Ocean, North Equatorial Current in Pacific Ocean.
The movement of ocean currents from high latitudes (temperate and polar regions) to low latitudes (tropical regions) is called cold currents, e.g. Labrador Current in Atlantic Ocean and Peruvian Current in Pacific Ocean.
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संबंधित प्रश्न
Consider the following statements.
- Most of the fishing grounds occur in areas where the continental shelf is wide.
- Fishing is well developed in warm tropical watersMixing of warm and cold currents facilitates plant nutrients for fish.
- Inland fishing became significant in India.
Assertion (A): Atolls are more common in the Atlantic ocean.
Reason(R): The marine population at the depth is less.
Assertion (A): The Ocean water is dynamic
Reason (R): Waves and currents are in horizontal motion while tides have vertical motion.
Assertion (A): The gravitational pull of the sun and moon on earth cause tides on sea water.
Reason (R): Neap tides are caused when the first and last quarter moon appears.
Assertion (A): On the basis of temperature, ocean currents can be classified as warm currents and cold currents.
Reason (R): The movement of ocean current from the low latitudes towards high latitudes cause cold current.
Write a note on ONGC.
Explain the term
Continental Rise
Assertion (A): The ocean/seawater does not contains calcium in great quantities.
Reason (R): Many of the aquatic animals with shells use the dissolved calcium in the seawater to build their protective shells.
Write a short note on the movement of the ocean water.
Give reason for the following.
Oceans are the lifelines of Earth and Mankind.
