Explanation:

Every three to seven years, a complicated weather system called EI-Nino causes droughts, floods, and other extreme weather conditions in many parts of the world. With the emergence of warm currents off the coast of Peru in the Eastern Pacific, the system encompasses both oceanic and atmospheric processes and influences weather in many countries, including India. EI-Nino is essentially an extension of the warm equatorial current, which briefly replaces the cold Peruvian current or Humboldt current. The water temperature along the Peruvian coast is raised by this stream. This results in: ? the distortion of equatorial atmospheric circulation; ? irregularities in the evaporation of sea water ? reduction in the amount of planktons which further reduces the number of fish in the sea.