Question

How much percentage of earth's surface is constituted by ocean?

• A. 65%
• B. 71%
• C. 79%
• D. 81%

Hint:

Remember: Oceans = 71% of earth's surface, Land = 29%. The Pacific Ocean alone accounts for about one-third of total ocean area.

Answer 1

The Correct Option is B

Step 1: Total earth surface.
The earth's total surface area is about 510 million square kilometers.

Step 2: Oceans and land distribution.
- About 71% of the surface is covered by oceans (Pacific, Atlantic, Indian, Arctic, Southern). - The remaining 29% is land (continents and islands).

Step 3: Eliminate other options.
65%, 79%, and 81% are incorrect figures. The scientifically accurate figure is 71%.

Final Answer: \[ \boxed{\text{Oceans cover 71% of earth's surface.}} \]