What percentage of the earth is made up of water?

Answer 1

About 71% of the Earth's surface is water, though it only makes up around 0.02% of the planet's total mass.

Considering that the Earth is 6400 miles thick, the crust is extremely thin—about 25 miles on average—and the ocean is rarely 10 miles thick.

Also, water has a density of about #1gcm^-3# at room temperature and pressure, while granite is around #2.7gcm^-3#. While not all rock on earth is granite, it is a fairly good example that rock is heavier in the same volume than water is, so water would not make up a vast majority of the Earth's mass.

The amount of water vapor in the atmosphere and below the surface is not included in this calculation because it is difficult to measure and would not have a significant impact overall.

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Answer 2

Layla Anderson

Approximately 71% of the Earth's surface is covered by water.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.