Answer :
The average depth of the ocean is about 3,800 meters, while the average elevation of land is about 840 meters.
What is the elevation
There are a few reasons for this difference. First, the Earth is not a perfect sphere. It is slightly flattened at the poles and bulging at the equator. This means that the average depth of the ocean is greater in the Northern and Southern Hemispheres, where the Earth is flatter, than it is in the Equatorial region, where the Earth is bulging.
Second, the Earth's crust is not uniform. There are areas of the Earth's crust that are thicker than others. These thicker areas of crust are called continents. The continents are less dense than the ocean floor, so they float higher on the Earth's mantle.
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