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How much percentage (%) of the EarthтАЩs Surface is covered with water?
About 70%
About 90%
About 60%
None of these
About 70%
Approximately 71% of the Earth's surface is covered by water, primarily contained within the global oceans. This surface water distribution is a fundamental parameter in hydrology and meteorology, influencing the global climate and water cycle.
Approximately 71% of the Earth's surface is covered by water, primarily contained within the global oceans. This surface water distribution is a fundamental parameter in hydrology and meteorology, influencing the global climate and water cycle.
fwaterтАЛ=AtotalтАЛAwaterтАЛтАЛтЙИ0.71 тАФ The ratio of water-covered surface area to total Earth surface area.
The distribution of water on Earth is governed by planetary formation and volcanic outgassing followed by condensation, which filled the oceanic basins. Gravity keeps the majority of this liquid water in low-lying depressions, while the remaining surface is occupied by continental landmasses.
Oceans account for roughly 97% of Earth's total water volume.
The remaining 3% is freshwater, found in glaciers, groundwater, lakes, and rivers.
Hydraulic cycle dynamics are heavily dependent on this high surface area coverage.
Mean depth of the ocean is approximately 3,700 meters.
Acts as a massive heat sink regulating global temperatures.
Supports vast biodiversity and oceanic ecosystems.
High salinity makes most surface water (seawater) unsuitable for direct consumption.
Large surface area contributes to storm intensification (e.g., hurricanes).
Climate modeling and weather forecasting.
Water resource management and civil engineering infrastructure planning.
Navigation and marine logistics.
Technically, the value is often cited as between 70.8% and 71%.
Option B (90%) is significantly overestimated, ignoring the substantial landmasses visible on the globe.
A is correct тАФ The Earth's surface consists of approximately 71% water, primarily contained within the oceanic basins.
In Civil Engineering exams regarding Irrigation and Hydrology, remember that while 71% is covered by water, only about 0.01% of the total water on Earth is readily available for human use as surface freshwater.