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There are two types of biochemical cycles, the gaseous and the sedimentary. In gaseous cycles the main reservoir of nutrients is the atmosphere and the ocean. In sedimentary cycles the main reservoir is the soil and the sedimentary and other rocks of the earth's crust. Both involve bionic and abionic agents, both are driven by the flow of energy and both are tied to the water cycle. Water Cycle: Living organisms, atmosphere and earth maintain between them a circulation of water and moisture, which is referred to as water cycle or hydrologic cycle. As we have already discussed in chapter 10, water forms a very significant factor of environment and without the cycling of water, biochemical cycles could not exist, ecosystems could not function, and life could not be maintained. Water is important for an ecosystem for several reasons-it is the medium by which nutrients are introduced into autotrophic plants; it is an important part of living tissue, either as liquid water or as part of essential organic molecules; it serves as a means of thermal regulation for both plants and animals; it is the medium by which sediments-a prime source of mineral nutrients-are removed from or added to local ecosystems; it covers the great majority of the earth's surface, and is the dominant feature of all aquatic ecosystems. The hydrologic cycle is driven by solar energy and gravity. More than 80 per cent of the total insulation that is not lost immediately as electromagnetic radiation goes to evaporate water. The atmospheric water vapor produced by this means can then con-dense around particles of dust in the atmosphere, often called nucleation particles. The atmosphere possesses a limited capacity for holding water vapor, thus, the droplets formed by this means are heavy enough to fall as precipitation under the influence of gravity. Eventually, the hydrologic cycle can be defined as an alternation of evaporation and precipitation, with the energy used to evaporate the water being dissipated as heat in the atmosphere as the water condenses. Distribution of water in earth's surface: Water is not evenly distributed throughout the earth. Almost 95 per cent of the total Water on earth is chemically bound into rocks and does not cycle. Of the remainder about 97.3 per cent is in the ocean, about 2.1 Per cent exists as ice in the polar caps and permanent glaciers, and rest is fresh water, present in the form of atmospheric water vapor, ground water, soil water, or inland surface water (Nace, 1967). Table: 19 1. Distribution of water in the earth's crust and surface (Clapham, Jr., 1973): A. Chemically bound water of rocks: Does not cycle 1. Crystalline rocks - 250,000
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The Important Types of Biochemical Cycles
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The Important Types Of Biochemical Cycles

Words: 437    Pages: 2    Paragraphs: 7    Sentences: 22    Read Time: 01:35
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              There are two types of biochemical cycles, the gaseous and the sedimentary. In gaseous cycles the main reservoir of nutrients is the atmosphere and the ocean.
             
              In sedimentary cycles the main reservoir is the soil and the sedimentary and other rocks of the earth's crust. Both involve bionic and abionic agents, both are driven by the flow of energy and both are tied to the water cycle.
             
              Water Cycle:
             
              Living organisms, atmosphere and earth maintain between them a circulation of water and moisture, which is referred to as water cycle or hydrologic cycle. As we have already discussed in chapter 10, water forms a very significant factor of environment and without the cycling of water, biochemical cycles could not exist, ecosystems could not function, and life could not be maintained.
             
              Water is important for an ecosystem for several reasons-it is the medium by which nutrients are introduced into autotrophic plants; it is an important part of living tissue, either as liquid water or as part of essential organic molecules; it serves as a means of thermal regulation for both plants and animals; it is the medium by which sediments-a prime source of mineral nutrients-are removed from or added to local ecosystems; it covers the great majority of the earth's surface, and is the dominant feature of all aquatic ecosystems.
             
              The hydrologic cycle is driven by solar energy and gravity. More than 80 per cent of the total insulation that is not lost immediately as electromagnetic radiation goes to evaporate water. The atmospheric water vapor produced by this means can then con-dense around particles of dust in the atmosphere, often called nucleation particles.
             
              The atmosphere possesses a limited capacity for holding water vapor, thus, the droplets formed by this means are heavy enough to fall as precipitation under the influence of gravity. Eventually, the hydrologic cycle can be defined as an alternation of evaporation and precipitation, with the energy used to evaporate the water being dissipated as heat in the atmosphere as the water condenses.
             
              Distribution of water in earth's surface:
             
              Water is not evenly distributed throughout the earth. Almost 95 per cent of the total Water on earth is chemically bound into rocks and does not cycle. Of the remainder about 97. 3 per cent is in the ocean, about 2. 1 Per cent exists as ice in the polar caps and permanent glaciers, and rest is fresh water, present in the form of atmospheric water vapor, ground water, soil water, or inland surface water (Nace, 1967).
             
              Table: 19 1. Distribution of water in the earth's crust and surface (Clapham, Jr. , 1973):
             
              A. Chemically bound water of rocks: Does not cycle
             
              1. Crystalline rocks - 250,000
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