Chapter 1

Chapter 1 - Chapter 1 Note Most figures are from the text...

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Chapter 1 Note: Most figures are from the text
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Cycles and things
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Air, water, earth, life, and technology are strongly interconnected as shown in the following figure. Traditionally, environmental science has been divided among the study of the atmosphere , the hydrosphere , the geosphere , and the biosphere . However, for better or for worse, the environment in which all humans must live has been affected irreversibly by technology. Therefore, technology is considered strongly within a separate environmental sphere called the anthrosphere in terms of how it affects the environment
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Toxicological chemistry has developed as a discipline that relates the chemical nature of substances to their toxic effects.
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Hydrosphere The hydrosphere contains Earth's water. Water is a vitally important substance in all parts of the environment. Water is an essential part of all living systems and is the medium from which life evolved and in which life exists. Water covers about 70% of Earth's surface. It plays a key role in many segments of the anthrosphere, such as in boilers or municipal water distribution systems. Over 97% of Earth's water is in oceans, and most of the remaining fresh water is in the form of ice. …. .only a relatively small percentage of the total water on Earth is actually involve with terrestrial , atmospheric, and biological processes. Exclusive of seawater, the water that circulates through environmental processes and cycles occurs in the atII1osphere, underground as groundwater,and as surface water in streams, rivers, lakes, ponds, and reservoirs
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The atmosphere The atmosphere is a thin protective blanket that nurtures life on Earth and protects it from the hostile environment of outer space by absorbing energy and damaging ultraviolet radiation from the sun and by moderating the Earth’s temperature to within a range conducive to life. It is the source of carbon dioxide for plant photosynthesis and of oxygen for respiration. It provides the elemental nitrogen that nitrogen-fixing bacteria and ammonia- manufacturing industrial plants use to produce chemically bound nitrogen, an essential component of life molecules.
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The Geosphere The most important part of the geosphere for life on Earth is soil formed by the disintegrative weathering action of physical, geochemical, and biological processes on rock. It is the medium
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This note was uploaded on 10/11/2011 for the course ENVS 4101 taught by Professor Portier during the Spring '10 term at LSU.

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Chapter 1 - Chapter 1 Note Most figures are from the text...

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