The mean depth of the trenches is 8. The total area of the hadal zone is less than 0. The majority run up the western Pacific. Most of the hadal trenches in their modern form are believed to have formed Earth appears to be the only terrestrial planet with subduction zones and plate tectonics. Mars appears to have tectonically ceased, and Venus is dominated by thick lithosphere with mantle plumes. On Earth, subduction zones produce continental crust, which can protrude from the ocean the continents.
It has been speculated that without subduction, the land would still be underwater and terrestrial life, including humans, would never have evolved. However, hydrostatic pressure increases linearly by 1 atmosphere atm for every ten metres of depth. The pressure at hadal depths therefore ranges from to 1, atmospheres.
The pressure at the deepest point is, therefore, equal to a one tonne weight being placed on the end of your finger. In this layer, there is plenty of sunlight, which allows for photosynthesis to take place.
Seas are generally much shallower than oceans, just as they are smaller. Regardless, some seas have great depths, such as the Caribbean, which is the deepest in the world at 7, meters—a number significantly higher than the average depth of the ocean. Experts estimate that there are approximately one million species of animals living in the ocean; however, they are not evenly spread out across the globe.
Numerous factors influence the amount and level of diversity of these creatures within specific regions. Such factors include temperature, depth, and distance from land. Fish and other aquatic animals tend to thrive in seas because they are friendlier environments. Oceans, which are typically far deeper and vast, host more basic life forms like plankton and shrimp.
Due to this primary difference, seas are used more for commercial fishing, while oceans are utilized for mining other resources, such as oil and natural gases. There is one global ocean, a vast continuous body of salt water that can be broken down into five major basins. Seas, on the other hand, are typically small areas of an ocean that are partially enclosed by land. They both vary in size, depth, and diversity.
Earth is covered primarily by water. Because of this, the more we learn about our oceans and seas, the more we can begin to fully understand our beautiful blue planet. Follow Share Cite Authors. Share this comparison: If you read this far, you should follow us: "Ocean vs Sea. Comments: Ocean vs Sea. Related Comparisons.
Contribute to Diffen Edit or create new comparisons in your area of expertise. Log in ». Terms of use Privacy policy. Though generally described as several 'separate' oceans, these waters comprise one global, interconnected body of salt water sometimes referred to as the World Ocean or global ocean. The Arctic Ocean is the smallest, shallowest ocean, with an average depth of 1, m and a maximum depth of 5, meters. There are numerous seas of varying sizes, shapes, characteristics, and depths.
The South China Sea is the second-deepest sea, at 5, m below sea level.
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