Question

About how much water is recycled in the form of rains per year?

• A. 4.46 $\times {10}^5$ gram per year
• B. 4.46 $\times {10}^{10}$ gram per year
• C. 4.46 $\times {10}^{20}$ gram per year
• D. 4.46 $\times {10}^{30}$ gram per year

Answer 1

The correct option is C 4.46 $\times {10}^{20}$ gram per year

Water exists at the earth's surface as liquid, solid, and vapour. It is changing from one of those three states to another. The total amount of water near the surface of the earth stays almost the same through time. One of the most important steps in the water cycle involves evaporation of water from the ocean surface, transport in the form of water vapour to the continents by winds, and precipitation as rain or snow on the continents. The rainfall then runs off by way of streams, rivers, and groundwater back to the ocean. Almost 4.46 10^20 gram per year of water is recycled in the form of rains per year.

Therefore, the correct answer is option C.