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Aman Shergill

· started a discussion

· 1 Months ago

Wrong Answer (Question: 217905.0 )

It has been estimated that there are 1386 million cubic kilometers of water on Earth.[3] This includes water in liquid and frozen forms in groundwater, oceans, lakes and streams. Saltwater accounts for 97.5% of this amount. Fresh water accounts for only 2.5%. Of this fresh water, 68.9% is in the form of ice and permanent snow cover in the Arctic, the Antarctic, and mountain glaciers. 30.8% is in the form of fresh groundwater. Only 0.3% of the fresh water on Earth is in easily accessible lakes, reservoirs and river systems.[3] The total mass of the Earth's hydrosphere is about 1.4 × 1018 tonnes, which is about 0.023% of Earth's total mass. About 20 × 1012 tonnes of this is in Earth's atmosphere (for practical purposes, 1 cubic metre of water weighs one tonne). Approximately 75% of Earth's surface, an area of some 361 million square kilometers (139.5 million square miles), is covered by ocean. The average salinity of Earth's oceans is about 35 grams of salt per kilogram of sea water (3.5%).[4]

Question:

Which of the following statements about the hydrosphere is correct?

Options:
A)

 

It consists of all water bodies of the Earth.

B)

 

Of the total amount of water found on the Earth, 70% is in the form of oceans.

C)

 

20% water is available in the form of ice sheets, glaciers and underground water.

D)

 

Only 10% of water is available as fresh water for human use.

Solution:

Ans: (d) All forms of water (oceans, rivers, lakes, glaciers, underground water, water vapour, etc.) available on the Earth are collectively called hydrosphere. Of the total amount of the Earth’s water, 97% is in the form of oceans and 3% is in the form of ice sheets, glaciers and underground water. Less than 1% portion is available as fresh water for human use.

Knowledge Expert

· commented

· 1 Months ago

@Aman Shergill

yes we fixed ambiguity of this question. now required answer is option (A).

nilesh kumar

· commented

· 1 Months ago

please read the question carefully.

Aman Shergill

· commented

· 1 Months ago

Option A can't be the answer kindly check
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