Question

Total earth’s surface covered by water is
A. $75\% $
B. $60\% $
C. $85\% $
D. $71\% $

Answer 1

Hint: The cover of land to deduce the water-coverage of earth. The earth is covered either by land or by water. The land covers around $29\% $ of the total earth surface.

Step by step answer: Water is one of the most essential substances in the world. It is vital for life for all the life forms be it plants, animals, or microbes. Due to the majority of water coverage, the earth is also known as the blue planet. Blue here, signifies water due to its color.
Only option D is correct as water covers only $71\% $ of the total earth’s crust.
Hence option D is correct.
Additional Information: The water coverage is done in the forms of sea, oceans, lakes, groundwater, glaciers, rivers, estuaries, ponds, and streams. Out of $71\% $ water, $96.5\% $ of total water is saline, which means having salt, leaving us with only 2.5% fresh water to consume. Saline water is in the form of oceans and seas. $68.7\% $ of the freshwater is stored in the form of ice caps and glaciers, $30.1\% $ is the forms of groundwater, and the rest $1.2\% $ in the form of surface freshwater. The $1.2\% $ freshwater is again distributed into $69\% $ ground ice, $20.9\% $ lakes, $3.8\% $ in soil, $2.6\% $ in swamps and marshes, $0.49\% $ rivers, $0.26\% $ in life forms and $3\% $ in the atmosphere. The earth has five main oceans, the Arctic ocean, Antarctic ocean, Pacific ocean, Indian oceans, and the Atlantic ocean.

Note: The earth has a total surface area of about 540 million ${\text{k}}{{\text{m}}^2}$. We know $29\% $ of total Earth’s surface is covered by land in the form of continents and islands. The land has different terrains which differ from place to place. They can be classified as plateaus, plains, deserts, mountains, etc.