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Covers 30 percent of the earths landmass, covers 20 million square miles of ocean, touches more than 67 percent of the earths coastline
-As temperature increases, density increases (due to thermal expansion) -As salinity increases, density increases (due to the addition of more dissolved material) -As pressure increases, density increases (due to the compressive effects of pressure) of these 3 factors, only temperature and salinity influence the density of surface water. Pressure influences seawater density only when very high pressures are encountered, such as in deep ocean trenches.'' (Thurman H., et al, 2002)
"Okeanos (Oceanus) in Greek) is a major body of saline water, and a principal component of the hydrosphere. Approximately 71% of the Earth's surface (an area of some 361 million square kilometers) is covered by ocean"- Ocean; WikipediaBy this estimate, Earth is approximately 508.45 million square kilometers..71x = 361x = 508.45510,072,000 km squared, total. About 30 percent land About 70 percent water See link for more information.
The height of the surface of the ocean is referred to as sea level.
Its SAND