Question

Percentage of freshwater in the hydrosphere is
A) 2.5%
B) 30%
C) 13%
D) 33%

Answer 1

Hint: Water on Earth is 1,386 million cubic kilometers (333,000,000 cubic miles). It comprises water in groundwater, seas, reservoirs and streams of liquid and frozen types. 97.5 percent of this volume is saltwater.

Complete answer:
First we should know about the hydrosphere to answer this question. The hydrosphere is the accumulated mass of water present on a planet, or natural satellite on, below, and above the earth. While the Earth's hydrosphere has been there for approximately 4 billion years, its shape tends to transform. This is caused by the spreading of the seafloor and continental drift, which reshapes the land and water.
Now, let us find the solution from the options-
- The fresh water percentage in the hydrosphere is 2.5 percent. With this, in icecaps and reservoirs, approximately 68 percent with fresh water is contained and about 30 percent is contained in reservoirs. Around 98.5 percent of the hydrosphere’s supply is salt water.
- The total density of the hydrosphere of the Planet is about 1.4 1018 tonnes, which is around 0.023 percent of the entire mass of the Earth. Thus, option B is not the correct option.
- In this fresh water, in the Antarctic, Arctic, and mountain glaciers, 68.9 percent is in the ice form and permanent snow cover form; 30.8 percent is in the form of additional groundwater; and just 0.3 percent of the Earth's freshwater is in readily available streams, rivers and water bodies. Thus option C is not the correct option.
- An region of some 361 million square kilometers (139.5 million square miles), some 71 percent of the Earth’s land, is occupied by the ocean. Thus, option D is not the correct option.

Thus, the correct answer is option (A) 2.5%

Note:IIn its current shape, the hydrosphere plays an essential role in the life of the atmosphere. In this respect, the oceans are significant. Just a very thin atmosphere rich in helium and hydrogen, close to the current atmosphere of Mercury, was present when the Planet was formed.