Approximately how much percentage (nearest to integer) of total water on the surface of earth is accounted for by the oceans?

The correct answer is 97%.

To understand this, let us break down the distribution of all water found on the surface of the Earth — this includes oceans, ice caps, glaciers, freshwater lakes, rivers, groundwater, and water vapour in the atmosphere.

Step 1: Understand what "total water on Earth's surface" means

Scientists estimate the total volume of water on Earth (the hydrosphere) to be approximately 1.386 billion km³. This enormous quantity is distributed across several reservoirs:

• Oceans and seas
• Ice caps, glaciers, and permanent snow
• Groundwater (underground aquifers)
• Surface freshwater (rivers, lakes, swamps)
• Other (soil moisture, atmosphere, biota, etc.)

Step 2: Identify the share held by oceans

Of the total ~1.386 billion km³ of water on Earth:

• Oceans hold approximately 1.335 billion km³
• All other sources (ice caps, glaciers, groundwater, freshwater, etc.) together account for the remaining ~0.051 billion km³

Step 3: Calculate the percentage

\frac{1.335}{1.386}\times 100\approx \mathrm{96.32\%}\approx \mathrm{97\%}

Rounding to the nearest integer, this gives us approximately 97%.

Step 4: Eliminate the other options

• 94% and 92% significantly underestimate the ocean's share — they are too low.
• 96% is close, but the standard accepted figure used in geography and earth sciences rounds to 97% as the nearest integer, since the computed value (~96.5% or above) rounds up.
• 97% is the universally cited and textbook-accepted approximate value.

Conclusion: The oceans are by far the largest reservoir of water on Earth, holding approximately 97% of all surface water. This is why Earth is often called the "Blue Planet." The remaining ~3% is freshwater, of which most is locked in glaciers and ice caps, leaving only a tiny fraction as accessible freshwater in rivers and lakes.