How much of the earth's surface is water?
http://ga.water.usgs.gov/edu/earthhowmuch.html
To find out how much of the Earth's surface is water, we can look to scientific data. The Earth's surface is approximately 510 million square kilometers. To determine the amount that is covered by water, we need to consider the percentage of water to land.
Scientists estimate that about 71% of the Earth's surface is covered by water, while the remaining 29% is land. This means that approximately 361 million square kilometers of the Earth's surface is water.
It's important to note that these numbers are an estimate and can vary slightly depending on the source of the data. Additionally, these numbers include all bodies of water, such as oceans, seas, lakes, rivers, and even the polar ice caps.