It is thought that the earliest living organisms probably emerged in a watery soup. This planet contains proportionately more surface water than comparable bodies in the inner solar system. One hypothesis that has gained popularity among scientists is that the early Earth was subjected to a period of bombardment by comets and water-rich asteroids.
Water cycle The water cycle refers to the transfer of water from one state or reservoir to another. Reservoirs include atmospheric moisture snow, rain and cloudsstreams, oceans, rivers, lakes, groundwatersubterranean aquiferspolar ice caps and saturated soil. Solar energyin the form of heat and light insolationand gravity cause the transfer from one state to another over periods from hours to thousands of years.
Most evaporation comes from the oceans and is returned to the earth as snow or rain. Transpiration refers to the expiration of water through the minute pores or stomata of trees. Evapotranspiration is the term used by hydrologists in reference to the three processes together, transpiration, sublimation and evaporation.
The hydrosphere is intricate, complex, interdependent, all-pervading and stable and "seems purpose-built for regulating life. Water can be polluted, abused, and misused but it is neither created nor destroyed, it only migrates.
There is no evidence that water vapor escapes into space. This is water that evaporates from the oceanic surfacekm3 and from land 74, km3.
Define hydrosphere. hydrosphere synonyms, hydrosphere pronunciation, hydrosphere translation, English dictionary definition of hydrosphere. n. 1. The waters of the earth's surface as distinguished from those of the lithosphere and the atmosphere. 2. The water vapor in the earth's atmosphere. The Earth's hydrosphere consists chiefly of the oceans, but technically includes clouds, inland seas, lakes, rivers, and underground waters. The abundance of water on Earth is a unique feature that distinguishes our "blue planet" from others in the solar system. The hydrosphere is the world of water that surrounds all of us. Because water is so important, it makes up an entire section of the earth sciences. You will probably hear the term " hydro " many times.
The same amount of water falls as atmospheric precipitation,km3 on the ocean andkm3 on land. Oceans are important in this regard. When the Earth was formed it had only a very thin atmosphere rich in hydrogen and helium similar to the present atmosphere of Mercury.
Later the gases hydrogen and helium were expelled from the atmosphere.
The gases and water vapor released as the Earth cooled became its present atmosphere. Other gases and water vapor released by volcanoes also entered the atmosphere. As the Earth cooled the water vapor in the atmosphere condensed and fell as rain. The atmosphere cooled further as atmospheric carbon dioxide dissolved in to rain water.
In turn this further caused the water vapor to condense and fall as rain. It is estimated that this occurred about million years ago. The first life forms began in the oceans. These organisms did not breathe oxygen.Only 3% of the hydrosphere is fresh water, and most is trapped in ice or underground The water cycle includes evaporation, condensation, precipitation, infiltration and transpiration Learning Outcomes.
Water participates in many important natural chemical reactions and is a good solvent. Changing any part of the Earth system, such as the amount or type of vegetation in a region or from natural land cover to an impervious one, can affect the rest of the system.
Hydrosphere, discontinuous layer of water at or near Earth’s surface. It includes all liquid and frozen surface waters, groundwater held in soil and rock, and atmospheric water vapour. Water is the most abundant substance at the surface of Earth. The hydrosphere, which consists of all the water on Earth, extends high into the atmosphere and deep into the lithosphere, or rocks and soil.
The lithosphere often gets carried upward into the atmosphere in the form of dust, and so forth. Hydrosphere definition is - the aqueous vapor of the atmosphere; broadly: the aqueous envelope of the earth including bodies of water and aqueous vapor in the atmosphere.
The Earth's hydrosphere consists chiefly of the oceans, but technically includes clouds, inland seas, lakes, rivers, and underground waters.
The abundance of water on Earth is a unique feature that distinguishes our "blue planet" from others in the solar system.