question_answer 43)

  Total earth's surface covered by water is (a) 75%                                 (b) 60%                                 (c) 85%                                 (d) 50%

Answer:

  (a) Water covers approximately 75% of the earth's surface and is vital for all known forms of life. On earth 96.5% of planets water is found in seas and oceans, 17% in groundwater and 1.7% in glaciers and ice caps and 0.001% in air as water vapour, clouds and precipitation. Only 2.5% of earth's water is fresh water and 98.8% of that water is in ice and groundwater. The remaining occurs as surface water (rivers, dams, cakes and ponds) and soil water.