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The atmosphere - Coggle Diagram
The atmosphere
atmospheric composition
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we depend on plants for food, and they depend on carbon dioxide. And without nitrogen to dilute the oxygen, fuels would burn too fast for us.
the gas we depend on most is oxygen. We need it for the process called respiration, that goes on in all our cells:
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The energy from respiration keeps us warm, and allows us to move, and enables hundreds of different reactions to go on in our bodies.
characteristics of gases
noble gases
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Helium is used to fill balloons, since it is very light, and safe.
nitrogen
Liquid nitrogen is very cold. (It boils at 2196 °C.) So it is used to quick, freeze food in food factories, and to freeze liquid in cracked pipes before repairing them.
unreactive. So it is flushed through food packaging to
remove oxygen and keep the food fresh. (Oxygen helps decay.)
oxygen
In hospitals, patients with breathing problems are given oxygen
through an oxygen mask, or in an oxygen tent.
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extraction of gases
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Extracting of sulfur
uses sulfur dioxides
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It is used to bleach wool, silk, and wood pulp for making paper.
It is used as a sterilizing agent in making soft drinks and jam, and in drying fruit. It stops the growth of bacteria and moulds.
Most sulfur is now obtained from the sulfur compounds found in petroleum and natural gas. These compounds are removed to help reduce air pollution.
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emissions
Carbon dioxide and methane are the two main ones we add to the atmosphere, through human activity. There is much more carbon dioxide than methane in the atmosphere.
The level of carbon dioxide is rising because we burn more fossil fuel each year. The carbon dioxide from this goes into the atmosphere. It cannot escape into space, and the ocean can dissolve only some of it.
The level of methane is rising because there is an increase in animal farming, and rice farming, around the world and more and more landfill site.