Natural Processes

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Biosphere

The part of the earth and its atmosphere in which living organisms exist or that is capable of supporting life. Ecosphere, lithosphere, hydrosphere and atmosphere together constitute Biosphere.

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Biosphere
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Atmosphere

The gaseous mass or envelope surrounding a celestial body, especially the one surrounding the earth, and retained by the celestial body's gravitational field. It consists of different layers like thermosphere, mesosphere, stratosphere, troposphere etc.

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Atmosphere
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Hydrosphere

The waters of the earth's surface as distinguished from those of the lithosphere and the atmosphere.

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Hydrosphere
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Carbon Cycle

The combined processes, including photosynthesis, decomposition, and respiration, by which carbon as a component of various compounds cycles between its major reservoirs - the atmosphere, oceans, and living organisms.

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Carbon Cycle
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Water Cycle

The cycle of evaporation and condensation that controls the distribution of the earth's water as it evaporates from bodies of water, condenses, precipitates, and returns to those bodies of water. Also called hydrologic cycle.

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Water Cycle
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Simplified diagram of Water Cycle

The slide shows the simplified diagram of water cycle with different processes.

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Simplified diagram of Water Cycle
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Pictorial representation of water cycle.

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Pictorial representation of water cycle.
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Nitrogen Cycle

The circulation of nitrogen in nature, consisting of a cycle of chemical reactions in which atmospheric nitrogen is compounded, dissolved in rain, and deposited in the soil, where it is assimilated and metabolized by bacteria and plants, eventually returning to the atmosphere by bacterial decomposition of organic matter.

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Nitrogen Cycle
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Nitrogen Cycle

Slide shows the different processes involved in the nitrogen cycle.

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Nitrogen Cycle
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Air Pollution

Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.

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Air Pollution
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Causes of Air Pollution

Air pollution is caused by oxides of carbon (Carbon monoxide, carbon-di-oxide), nitrogen, sulphur etc.

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Causes of Air Pollution
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Water Pollution

Water pollution is the contamination of water bodies (e.g. lakes, rivers, oceans and groundwater). Water pollution occurs when pollutants are discharged directly or indirectly into water bodies without adequate treatment to remove harmful compounds.

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Water Pollution
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Sources of Water Pollution

There are basically two types of sources of water pollution- point sources include discharges from a sewage treatment plant, factory etc. while non-point sources include leaching out of nitrogen compounds from fertilized agricultural lands, urban runoffs etc.

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Sources of Water Pollution
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Green House Effect

The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface, energy is transferred to the surface and the lower atmosphere. As a result, the temperature there is higher than it would be if direct heating by solar radiation were the only warming mechanism.

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Green House Effect
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Green House effect process

The slide shows the step by step process of green house effect and how it leads to global warming.

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Green House effect process
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Global Warming

The slide shows different processes involved in causing global warming.

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Global Warming
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