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Energy Cycle of Biosphere

            
             The energy that sustains all living systems is solar energy, fixed in photosynthesis and held briefly in the biosphere before it is reradiated into space heat. The total amount of solar energy fixed on the earth sets one limit on the total amount of life; the patterns of flow of this energy through the earth's ecosystems set addifional limits on the kinds of life on the earth. Solar energy has been fixed in one form or another on the earth throughout much of earth's 4.5 billion years history. The modern biosphere probably had its beginning about two billion years ago with the evolution of marine organisms that not only could fix solar energy in organic compounds but also did it by splitting the water molecule and releasing free oxygen. .
             Marine plant cells accumulated for hundreds of millions of years, gradually building an atmosphere that screened out the most destructive of the sun's rays and opened the land to exploitation by living systems. Evolution fited the new species together in ways that not only conserved energy and the mineral nutrients ultilized nutrients by recycling them, releasing more oxygen and making possible the fixation of more energy and the support of still more life. .
             The actual amount of solar energy diverted into living systems is small in relation to the earth's total energy budget. Only about a tenth of 1 percent of the energy received from the sun by the earth is fixed in photosynthesis. More than half of the energy fixed in photosynthesis is used immediately in plant's own respiration. .
             Changes accure slowly through a conjoint evolution that is not only biological but also chemical and physical. The time scale for most of changes and evolutions of developments, particulary in the later stages when many of the species have larger bodies and long life cycles, is very long.
             Green plants are the "primary producers" of the biosphere, converting solar energy into organic compounds that maintain the plants and other living things.


Essays Related to Energy Cycle of Biosphere

1. Air Quality in a Biosphere

... since the middle ages. In recent times, due to the rapid growth of population and the rapid growth of industrialization, it has become a frontline affair for public concern. The demand for a new style of living and the changing periods (e.g. 60's, 70's) has put the demand for new items and more efficient energy to an all-new high. These, as everybody knows, are at the ... Nitrogen Dioxide and Molecular Oxygen, the two primary substances. NO (Nitric Oxide) + O3 (ozone) = NO2 (Nitrogen Dioxide) + O2 (Molecular Oxygen) This would be a great cycle but it isn't. The entrance of Hydrocarbons ...

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  • Approx Pages: 7
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2. The Structural Parts of the Earth

... the underlying mantle rocks by its composition, lower density, and the lower velocity at which it conducts seismic energy. Most of the crust can be classified either as continental or oceanic. These two types of crust differ in their average age, composition, thickness and mode of origin. The crust has a variable thickness, being 35-70 km thick in the continents and 5-10 km thick ... less than 1 m below the planet's surface to more than 10,000 km above the planet's surface. The upper portion of the atmosphere protects the organisms of the biosphere from the sun's ultraviolet radiation. ...

  • Word Count: 1504
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3. Carbon Sink of Trees at SAS

Shanghai American School is home to over 300 trees, numerous shrubs and plant life that all contribute to the carbon cycle. Although this is the case, SAS does not have enough of a carbon sink in trees on campus to sustain the amount in printing paper. A tree absorbs CO2 (photosynthesis), uses it to produce food for its own survival, storing it as biomass ... as follows (formulae given by Hogan): (I used a digital scale in class and calculated that a piece of paper weighs 4.5 grams). (8,730,607pieces of paper*4.5g)/1000= Weight of paper consumed = 39287.7315 kg 39287.7315 kg*7.24 = 284443.18...

  • Word Count: 865
  • Approx Pages: 3
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4. Human interference in biogeochemical cycles: Causes, Consequ

... are briefly discussed below. Biogeochemical Cycles Firstly, carbon is one of the most common elements on Earth and it is the basis of all living organisms. The biogeochemical carbon cycle described the fluxes of carbon in its many forms among the biosphere, atmosphere, oceans, and geosphere. There are four main reservoirs of stored carbon in the carbon cycle; namely (1) as carbon dioxide in the atmosphere; (2) as ... utilities. Also, designing and orienting our homes to make better use of the sun's energy for heating and natural lighting can substantially reduce energy needs. It has been ...

  • Word Count: 2448
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5. Acid Rain

... worried about acid rain? What problems does it cause? Well, acid rain causes many, many problems. Acid rain affects biotic life, the ecosystem, the biosphere (the life in the environment), the hydrosphere (water cycle), man-made structures; basically everybody is affected by acid rain somehow. The acids in acid rain react chemically with any object they contact. Acids are corrosive ... very serious matter. For example plants (the primary order) is affected, this will result in effect on organisms which are dependent on plants as energy and this will go on- eventually this may destroy the...

  • Word Count: 1710
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6. Perversion

... might have felt about the atomic bomb. On a still dark morning July 16, 1945, the Northern New Mexico landscape flashed white with the detonation of the first atomic bomb (Calloway 1). Did Tesla turn over in his grave or did he applaud? Over 105,000 people were instantly vaporized or ... wonder what poisons are being bled into our biosphere, the Earth. It could be that our oceans are being polluted by the discharge of toxic cooling water, or that the estuaries near the power plants are being warmed beyond their ability to adapt. The cycle of life in our oceans could be permanently ... ...

  • Word Count: 950
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7. The Enviromental Tipping Point

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  • Word Count: 2460
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