(a) Warm and cold atmospheric currents meet
(b) Rivers drain out large amounts of freshwater into the sea
(c) Warm and cold oceanic currents meet
(d) Continental shelf is undulating
Answer: (c)
Ocean currents have a number of direct and indirect influences on human activities. West coasts of the continents in tropical and subtropical latitudes (except close to the equator) are bordered by cool waters. Their average temperatures are relatively low with a narrow diurnal and annual ranges. There is fog, but generally the areas are arid.
O West coasts of the continents in the middle and higher latitudes are bordered by warm waters which cause a distinct marine climate. They are characterised by cool summers and relatively mild winters with a narrow annual range of temperatures.
O Warm currents flow parallel to the east coasts of the continents in tropical and subtropical latitudes. This results in warm and rainy climates. These areas lie in the western margins of the subtropical anticyclones.
O The mixing of warm and cold currents helps to replenish the oxygen and favour the growth of planktons, the primary food for
fish population. The best fishing grounds of the world exist mainly in these mixing zones. [Option (c) is correct]
