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The ocean plays a key role in the water cycle as it is the source of 86% of global evaporation. [2] The water cycle involves the exchange of energy, which leads to temperature changes. When water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment.
Since liquid water flows, ocean waters cycle and flow in currents around the world. Since water easily changes phase, it can be carried into the atmosphere as water vapour or frozen as an iceberg. It can then precipitate or melt to become liquid water again. All marine life is immersed in water, the matrix and womb of life itself. [7]
The Earth's water cycle. About 97.5% of the water on Earth is saline; the remaining 2.5% is fresh water. Most fresh water – about 69% – is present as ice in ice caps and glaciers. [20] The average salinity of Earth's oceans is about 35 grams (1.2 oz) of salt per kilogram of seawater (3.5% salt). [21]
The water cycle is essential to life on Earth and plays a large role in the global climate system and ocean circulation. The warming of our planet is expected to be accompanied by changes in the water cycle for various reasons. [3] For example, a warmer atmosphere can contain more water vapor which has effects on evaporation and rainfall.
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Dams, interbasin transfer of water, and other human activities are thought to be the cause for the decrease in range. [ 6 ] In May 2001, two specimens were found in the Ohio River in Joppa, Illinois , the first ones in 50 years, indicating either that the species is returning to its former range, or that prior sampling methods were ineffective.
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The consequences from this usage occur from diverse activities and root themselves in complex, interdisciplinary systems and practices. [ 4 ] Environmental changes in rivers usually result from human development, such as population growth , the dependence on fossil resources , urbanization , global commerce and industrial and agricultural ...