Question

Part of earth covered by water is
A.71%
B.50%
C.92%
D.87%

Answer 1

Hint: Two third of our planet is covered by water. Most of the earth's surface is covered by water as in oceans, rivers, lakes etc but mainly by oceans. All this together constitutes the hydrosphere.

Complete answer:
Option A- of the total earth surface 71% part is covered by water rest 29% comprises land. The water part comprises oceans, rivers, lakes, underground water and ice.
Of the total volume of water on earth, 96.5% of the water is saltwater, only 3.5% is fresh water. Salt water has different kinds of salts in it, but it mostly has sodium chloride.
Most of that freshwater, 68% is trapped frozen in ice caps and glaciers and rest freshwater is found in lakes and streams, groundwater. This is mainly drinking water available for us. A very small amount is in our atmosphere, where it exists as water vapour. Groundwater exists in pores spaces and fractures in rocks and sediments beneath the earth’s surface.

We use less than 1% of the water on earth for drinking and personal use. We also use this freshwater for agriculture, fisheries, transportation, heating and cooling, manufacturing, and many other purposes. Saline water in oceans returns the freshwater to land as rain and snow by the process of evaporation.
Option B- 50% is incorrect option
Option C- it is an incorrect option
Option D- 87% is incorrect option
Correct option is A

Hence, the correct answer is option (A)

Note: Water is unevenly distributed, and most of it is unsuitable for drinking. Unless we use our freshwater supply wisely, rivers, lakes and groundwater can be depleted or polluted, becoming unusable or unsuitable for life.